From 156716d8c21290dcf47a7bca6c0240412a09f35f Mon Sep 17 00:00:00 2001
From: Radu Nichita <radunichita@Radus-Air.local>
Date: Fri, 17 Apr 2026 01:24:11 +0300
Subject: [PATCH] Add skel for lab06

Signed-off-by: Radu Nichita <radunichita@Radus-Air.local>
---
 algorithms/lab06/check                        |     6 +-
 .../sol1_bfs.cpp => 01-bfs/01-bfs.cpp}        |     8 -
 algorithms/lab06/cpp/02-dfs/02-dfs.cpp        |    89 +
 .../03-topsort_bfs.cpp}                       |     5 -
 .../03-topsort_dfs.cpp}                       |     5 -
 algorithms/lab06/cpp/task-3/sol1_dfs.cpp      |   122 -
 algorithms/lab06/cpp/task-4/sol1_bfs.cpp      |   117 -
 .../src/sol1_bfs.java => 01-bfs/src/Bfs.java} |     9 +-
 algorithms/lab06/java/02-dfs/src/Dfs.java     |   110 +
 .../src/TopsortBfs.java}                      |     7 +-
 .../src/TopsortDfs.java}                      |     7 +-
 .../lab06/java/task-3/src/sol1_dfs.java       |   144 -
 .../lab06/java/task-4/src/sol1_bfs.java       |   136 -
 algorithms/lab06/python/01-bfs/01-bfs.py      |    95 +
 algorithms/lab06/python/02-dfs/02-dfs.py      |    79 +
 .../lab06/python/03-topsort/03-topsort_bfs.py |   102 +
 .../lab06/python/03-topsort/03-topsort_dfs.py |    86 +
 algorithms/lab06/rust/01-bfs/01-bfs.rs        |   113 +
 algorithms/lab06/rust/02-dfs/02-dfs.rs        |    91 +
 .../lab06/rust/03-topsort/03-topsort_bfs.rs   |   119 +
 .../lab06/rust/03-topsort/03-topsort_dfs.rs   |   100 +
 .../lab06/tests/{task-1 => 01-bfs}/1.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/1.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/10.in      |     0
 .../lab06/tests/{task-1 => 01-bfs}/10.ref     |     0
 .../lab06/tests/{task-1 => 01-bfs}/2.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/2.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/3.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/3.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/4.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/4.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/5.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/5.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/6.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/6.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/7.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/7.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/8.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/8.ref      |     0
 .../lab06/tests/{task-1 => 01-bfs}/9.in       |     0
 .../lab06/tests/{task-1 => 01-bfs}/9.ref      |     0
 algorithms/lab06/tests/01-bfs/check_task      |     4 +
 .../lab06/tests/{task-1 => 01-bfs}/custom.in  |     0
 .../lab06/tests/{task-1 => 01-bfs}/custom.ref |     0
 algorithms/lab06/tests/02-dfs/1.in            |    26 +
 algorithms/lab06/tests/02-dfs/1.ref           |     1 +
 algorithms/lab06/tests/02-dfs/10.in           |  2701 +++
 algorithms/lab06/tests/02-dfs/10.ref          |     1 +
 algorithms/lab06/tests/02-dfs/2.in            |   101 +
 algorithms/lab06/tests/02-dfs/2.ref           |     1 +
 algorithms/lab06/tests/02-dfs/3.in            |     1 +
 algorithms/lab06/tests/02-dfs/3.ref           |     1 +
 algorithms/lab06/tests/02-dfs/4.in            | 20101 ++++++++++++++++
 algorithms/lab06/tests/02-dfs/4.ref           |     1 +
 algorithms/lab06/tests/02-dfs/5.in            |   101 +
 algorithms/lab06/tests/02-dfs/5.ref           |     1 +
 algorithms/lab06/tests/02-dfs/6.in            |   301 +
 algorithms/lab06/tests/02-dfs/6.ref           |     1 +
 algorithms/lab06/tests/02-dfs/7.in            |   701 +
 algorithms/lab06/tests/02-dfs/7.ref           |     1 +
 algorithms/lab06/tests/02-dfs/8.in            |  1701 ++
 algorithms/lab06/tests/02-dfs/8.ref           |     1 +
 algorithms/lab06/tests/02-dfs/9.in            |  2701 +++
 algorithms/lab06/tests/02-dfs/9.ref           |     1 +
 algorithms/lab06/tests/02-dfs/check_task      |     4 +
 .../lab06/tests/{task-2 => 02-dfs}/custom.in  |     0
 .../lab06/tests/{task-2 => 02-dfs}/custom.ref |     0
 .../lab06/tests/{task-2 => 03-topsort}/1.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/1.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/10.in  |     0
 .../lab06/tests/{task-2 => 03-topsort}/10.ref |     0
 .../lab06/tests/{task-2 => 03-topsort}/2.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/2.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/3.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/3.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/4.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/4.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/5.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/5.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/6.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/6.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/7.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/7.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/8.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/8.ref  |     0
 .../lab06/tests/{task-2 => 03-topsort}/9.in   |     0
 .../lab06/tests/{task-2 => 03-topsort}/9.ref  |     0
 .../tests/{task-2 => 03-topsort}/check_task   |     0
 algorithms/lab06/tests/03-topsort/custom.in   |     0
 algorithms/lab06/tests/03-topsort/custom.ref  |     0
 algorithms/lab06/tests/task-1/check_task      |     1 -
 91 files changed, 29443 insertions(+), 561 deletions(-)
 rename algorithms/lab06/cpp/{task-1/sol1_bfs.cpp => 01-bfs/01-bfs.cpp} (88%)
 create mode 100644 algorithms/lab06/cpp/02-dfs/02-dfs.cpp
 rename algorithms/lab06/cpp/{task-2/sol2_bfs.cpp => 03-topsort/03-topsort_bfs.cpp} (94%)
 rename algorithms/lab06/cpp/{task-2/sol1_dfs.cpp => 03-topsort/03-topsort_dfs.cpp} (93%)
 delete mode 100644 algorithms/lab06/cpp/task-3/sol1_dfs.cpp
 delete mode 100644 algorithms/lab06/cpp/task-4/sol1_bfs.cpp
 rename algorithms/lab06/java/{task-1/src/sol1_bfs.java => 01-bfs/src/Bfs.java} (91%)
 create mode 100644 algorithms/lab06/java/02-dfs/src/Dfs.java
 rename algorithms/lab06/java/{task-2/src/sol2_bfs.java => 03-topsort/src/TopsortBfs.java} (94%)
 rename algorithms/lab06/java/{task-2/src/sol1_dfs.java => 03-topsort/src/TopsortDfs.java} (94%)
 delete mode 100644 algorithms/lab06/java/task-3/src/sol1_dfs.java
 delete mode 100644 algorithms/lab06/java/task-4/src/sol1_bfs.java
 create mode 100644 algorithms/lab06/python/01-bfs/01-bfs.py
 create mode 100644 algorithms/lab06/python/02-dfs/02-dfs.py
 create mode 100644 algorithms/lab06/python/03-topsort/03-topsort_bfs.py
 create mode 100644 algorithms/lab06/python/03-topsort/03-topsort_dfs.py
 create mode 100644 algorithms/lab06/rust/01-bfs/01-bfs.rs
 create mode 100644 algorithms/lab06/rust/02-dfs/02-dfs.rs
 create mode 100644 algorithms/lab06/rust/03-topsort/03-topsort_bfs.rs
 create mode 100644 algorithms/lab06/rust/03-topsort/03-topsort_dfs.rs
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/1.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/1.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/10.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/10.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/2.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/2.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/3.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/3.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/4.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/4.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/5.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/5.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/6.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/6.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/7.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/7.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/8.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/8.ref (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/9.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/9.ref (100%)
 create mode 100755 algorithms/lab06/tests/01-bfs/check_task
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/custom.in (100%)
 rename algorithms/lab06/tests/{task-1 => 01-bfs}/custom.ref (100%)
 create mode 100644 algorithms/lab06/tests/02-dfs/1.in
 create mode 100644 algorithms/lab06/tests/02-dfs/1.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/10.in
 create mode 100644 algorithms/lab06/tests/02-dfs/10.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/2.in
 create mode 100644 algorithms/lab06/tests/02-dfs/2.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/3.in
 create mode 100644 algorithms/lab06/tests/02-dfs/3.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/4.in
 create mode 100644 algorithms/lab06/tests/02-dfs/4.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/5.in
 create mode 100644 algorithms/lab06/tests/02-dfs/5.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/6.in
 create mode 100644 algorithms/lab06/tests/02-dfs/6.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/7.in
 create mode 100644 algorithms/lab06/tests/02-dfs/7.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/8.in
 create mode 100644 algorithms/lab06/tests/02-dfs/8.ref
 create mode 100644 algorithms/lab06/tests/02-dfs/9.in
 create mode 100644 algorithms/lab06/tests/02-dfs/9.ref
 create mode 100755 algorithms/lab06/tests/02-dfs/check_task
 rename algorithms/lab06/tests/{task-2 => 02-dfs}/custom.in (100%)
 rename algorithms/lab06/tests/{task-2 => 02-dfs}/custom.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/1.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/1.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/10.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/10.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/2.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/2.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/3.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/3.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/4.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/4.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/5.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/5.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/6.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/6.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/7.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/7.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/8.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/8.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/9.in (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/9.ref (100%)
 rename algorithms/lab06/tests/{task-2 => 03-topsort}/check_task (100%)
 create mode 100644 algorithms/lab06/tests/03-topsort/custom.in
 create mode 100644 algorithms/lab06/tests/03-topsort/custom.ref
 delete mode 120000 algorithms/lab06/tests/task-1/check_task

diff --git a/algorithms/lab06/check b/algorithms/lab06/check
index 284fbcf..9f2e527 100755
--- a/algorithms/lab06/check
+++ b/algorithms/lab06/check
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: BSD-3-Clause
 
-NUM_TASKS=4
-TASKS=(task-1 task-2 task-3 task-4)
-NUM_TESTS=(10 10 0 0)
+NUM_TASKS=3
+TASKS=(01-bfs 02-dfs 03-topsort)
+NUM_TESTS=(10 10 10)
 
 TIMEOUT_CPP=1
 TIMEOUT_JAVA=1
diff --git a/algorithms/lab06/cpp/task-1/sol1_bfs.cpp b/algorithms/lab06/cpp/01-bfs/01-bfs.cpp
similarity index 88%
rename from algorithms/lab06/cpp/task-1/sol1_bfs.cpp
rename to algorithms/lab06/cpp/01-bfs/01-bfs.cpp
index 8082529..46ec98f 100644
--- a/algorithms/lab06/cpp/task-1/sol1_bfs.cpp
+++ b/algorithms/lab06/cpp/01-bfs/01-bfs.cpp
@@ -44,14 +44,6 @@ class Task {
     }
 
     vector<int> get_result() {
-        // TODO: Faceti un BFS care sa construiasca in d valorile cerute:
-        // * d[node] = numarul minim de muchii de parcurs de la nodul `source` la nodul `node`
-        //      * d[source] = 0
-        //      * d[node]   = -1, daca nu exista drum de la source la node
-        // *******
-        // ATENTIE: nodurile sunt indexate de la 1 la n.
-        // *******
-
         return bfs(source);
     }
 
diff --git a/algorithms/lab06/cpp/02-dfs/02-dfs.cpp b/algorithms/lab06/cpp/02-dfs/02-dfs.cpp
new file mode 100644
index 0000000..d83bbb5
--- /dev/null
+++ b/algorithms/lab06/cpp/02-dfs/02-dfs.cpp
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <vector>
+using namespace std;
+
+class Task {
+public:
+    void solve() {
+        read_input();
+        write_output(get_result());
+    }
+
+private:
+    // numarul maxim de noduri
+    static constexpr int NMAX = (int)1e5 + 5; // 10^5 + 5 = 100.005
+
+    // n = numar de noduri, m = numar de muchii/arce
+    int n, m;
+
+    // adj[node] = lista de adiacenta a nodului node
+    // exemplu: daca adj[node] = {..., neigh, ...} => exista muchia (node, neigh)
+    vector<int> adj[NMAX];
+
+    void read_input() {
+        ifstream fin("in");
+        fin >> n >> m;
+        for (int i = 1, x, y; i <= m; i++) {
+            // muchie (x, y)
+            fin >> x >> y;
+            adj[x].push_back(y);
+            adj[y].push_back(x);
+        }
+        fin.close();
+    }
+
+    int get_result() {
+        return solve_dfs();
+    }
+
+    // Complexitate: O(n + m)
+    int solve_dfs() {
+        int connected_components = 0;
+        vector<int> visited(n + 1, 0);
+
+        // pentru fiecare nod
+        for (int node = 1; node <= n; node++) {
+            // daca nodul este nevizitat, pornim o parcurgere
+            if (visited[node] == 0) {
+                connected_components++;
+                dfs(node, visited);
+            }
+        }
+
+        return connected_components;
+    }
+
+    // porneste o parcurgere DFS din node
+    // foloseste vectorul visited pentru a marca nodurile vizitate
+    void dfs(int node, vector<int>& visited) {
+        visited[node] = 1; // marchez nodul ca fiind vizitat
+
+        // parcurg vecinii
+        for (auto& neigh : adj[node]) {
+            if (visited[neigh] == 0) {
+                dfs(neigh, visited);
+            }
+        }
+    }
+
+    void write_output(int result) {
+        ofstream fout("out");
+        fout << result << '\n';
+        fout.close();
+    }
+};
+
+// [ATENTIE] NU modifica functia main!
+int main() {
+    std::unique_ptr<Task> task {new (nothrow) Task()};
+    if (!task) {
+        std::cerr << "new failed: WTF are you doing? Throw your PC!\n";
+        return -1;
+    }
+    task->solve();
+    return 0;
+}
diff --git a/algorithms/lab06/cpp/task-2/sol2_bfs.cpp b/algorithms/lab06/cpp/03-topsort/03-topsort_bfs.cpp
similarity index 94%
rename from algorithms/lab06/cpp/task-2/sol2_bfs.cpp
rename to algorithms/lab06/cpp/03-topsort/03-topsort_bfs.cpp
index 6866e3b..d987156 100644
--- a/algorithms/lab06/cpp/task-2/sol2_bfs.cpp
+++ b/algorithms/lab06/cpp/03-topsort/03-topsort_bfs.cpp
@@ -44,11 +44,6 @@ class Task {
     }
 
     vector<int> get_result() {
-        // TODO: Faceti sortarea topologica a grafului stocat cu liste de adiacenta din adj.
-        // *******
-        // ATENTIE: nodurile sunt indexate de la 1 la n.
-        // *******
-
         return solve_bfs();
     }
 
diff --git a/algorithms/lab06/cpp/task-2/sol1_dfs.cpp b/algorithms/lab06/cpp/03-topsort/03-topsort_dfs.cpp
similarity index 93%
rename from algorithms/lab06/cpp/task-2/sol1_dfs.cpp
rename to algorithms/lab06/cpp/03-topsort/03-topsort_dfs.cpp
index 7ea399d..4db06c0 100644
--- a/algorithms/lab06/cpp/task-2/sol1_dfs.cpp
+++ b/algorithms/lab06/cpp/03-topsort/03-topsort_dfs.cpp
@@ -36,11 +36,6 @@ class Task {
     }
 
     vector<int> get_result() {
-        // TODO: Faceti sortarea topologica a grafului stocat cu liste de adiacenta din adj.
-        // *******
-        // ATENTIE: nodurile sunt indexate de la 1 la n.
-        // *******
-
         return solve_dfs();
     }
 
diff --git a/algorithms/lab06/cpp/task-3/sol1_dfs.cpp b/algorithms/lab06/cpp/task-3/sol1_dfs.cpp
deleted file mode 100644
index 564dad4..0000000
--- a/algorithms/lab06/cpp/task-3/sol1_dfs.cpp
+++ /dev/null
@@ -1,122 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-
-#include <algorithm>
-#include <climits>
-#include <fstream>
-#include <iostream>
-#include <limits>
-#include <memory>
-#include <vector>
-
-using namespace std;
-
-class Task {
-public:
-    void solve() {
-        read_input();
-        write_output(get_result());
-    }
-
-private:
-    // numarul maxim de noduri
-    static constexpr int NMAX = (int)1e5 + 5; // 10^5 + 5 = 100.005
-
-    // n = numar de noduri, m = numar de muchii/arce
-    int n, m;
-
-    // adj[node] = lista de adiacenta a nodului node
-    // perechea (neigh, w) semnifica arc de la node la neigh de cost w
-    // FOLLOW-UP : Se poate o stocare mai eficienta pentru aceasta problema?
-    // Hint: Fiecare nod are exact un vecin (putem folosi un hashtable).
-    vector<pair<int, int>> adj[NMAX];
-
-    // Gradul intern al nodurilor.
-    vector<int> in_degree;
-
-    void read_input() {
-        cin >> n >> m;
-
-        in_degree.resize(n + 1);
-        for (int i = 0; i < m; ++i) {
-            int x, y, p;
-            cin >> x >> y >> p;
-            adj[x].push_back({y, p});
-            in_degree[y]++;
-        }
-    }
-
-    vector<pair<vector<int>, int>> get_result() {
-        return solve_dfs();
-    }
-
-    // Complexitate: O(n + m + n * log n): parcurgerea DFS - O(n + m), sortare - O(n log n)
-    // Observatie: Parcurgerea poate fi inlocuita si cu BFS.
-    vector<pair<vector<int>, int>> solve_dfs() {
-        // vectorul rezultat, contine lanturile si costul minim pentru ele
-        vector<pair<vector<int>, int>> all_components;
-
-        // visited[node] = 1 daca node a fost deja vizitat, 0 altfel
-        vector<int> visited(n + 1, 0);
-
-        // pentru fiecare nod
-        for (int node = 1; node <= n; ++node) {
-            // Incepem un lant nou doar daca nodul nu a fost vizitat
-            // si are gradul intern 0.
-            if (!visited[node] && in_degree[node] == 0) {
-                vector<int> current_component;
-
-                int min_cost = numeric_limits<int>::max();
-                dfs(node, visited, current_component, min_cost);
-
-                // O componenta cu un singur nod are costul minim 0
-                if (current_component.size() == 1) {
-                    min_cost = 0;
-                }
-                all_components.push_back({current_component, min_cost});
-            }
-        }
-
-        // Sortare crescatoare dupa start
-        sort(all_components.begin(), all_components.end(), 
-            [](auto &a, auto &b) { return a.first[0] < b.first[0]; });
-
-        return all_components;
-    }
-
-    // porneste o parcurgere DFS din node
-    // foloseste vectorul visited pentru a marca nodurile vizitate
-    void dfs(int node, vector<int>& visited, vector<int>& current_component, int& min_cost) {
-        visited[node] = 1; // marchez nodul ca fiind vizitat
-        current_component.push_back(node); // adaug nodul la componenta curenta
-
-        // parcurg vecinii
-        for (auto& [neigh, cost] : adj[node]) {
-            if (!visited[neigh]) {
-                min_cost = min(min_cost, cost);
-                dfs(neigh, visited, current_component, min_cost);
-            }
-        }
-    }
-
-    void write_output(vector<pair<vector<int>, int>>&& all_components) {
-        cout << all_components.size() << "\n";
-        for (const auto& [nodes, cost] : all_components) {
-            if (nodes.size() != 1) {
-                cout << nodes.front() << " " << nodes.back() << " " << cost << "\n";
-            } else {
-                cout << nodes[0] << " " << nodes[0] << " " << cost << "\n";
-            }
-        }
-    }
-};
-
-// [ATENTIE] NU modifica functia main!
-int main() {
-    std::unique_ptr<Task> task {new (nothrow) Task()};
-    if (!task) {
-        std::cerr << "new failed: WTF are you doing? Throw your PC!\n";
-        return -1;
-    }
-    task->solve();
-    return 0;
-}
diff --git a/algorithms/lab06/cpp/task-4/sol1_bfs.cpp b/algorithms/lab06/cpp/task-4/sol1_bfs.cpp
deleted file mode 100644
index ad5557e..0000000
--- a/algorithms/lab06/cpp/task-4/sol1_bfs.cpp
+++ /dev/null
@@ -1,117 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-
-#include <fstream>
-#include <iostream>
-#include <memory>
-#include <queue>
-#include <vector>
-using namespace std;
-
-class Task {
-public:
-    void solve() {
-        read_input();
-        write_output(get_result());
-    }
-
-private:
-    // numarul maxim de noduri
-    static constexpr int NMAX = (int)1e6 + 5; // 10^6 + 5 = 1.000.005
-
-    // n = numar de noduri, m = numar de muchii/arce
-    int n, m;
-
-    // p = numarul de taverne
-    int p;
-
-    // adj_trans[node] = lista de adiacenta a nodului node in graful transpus
-    // exemplu: daca adj_trans[node] = {..., neigh, ...} => exista arcul (node, neigh) in graful transpus
-    vector<int> adj_trans[NMAX];
-
-    // vector ce reține nodurile din taverne
-    vector<int> taverns;
-
-    void read_input() {
-        ifstream fin("berarii2.in");
-        fin >> n >> m >> p;
-
-        // Stocam graful transpus, vrem sa vedem intersectiile
-        // unde nu putem ajunge pornind din berarii.
-        for (int i = 1, x, y; i <= m; i++) {
-            fin >> x >> y;
-            adj_trans[y].push_back(x);
-        }
-
-        taverns.resize(p);
-        for (int i = 0; i < p; ++i) {
-            fin >> taverns[i];
-        }
-
-        fin.close();
-    }
-
-    vector<int> get_result() { return bfs(taverns); }
-
-    // Complexitate: O(n + m)
-    vector<int> bfs(std::vector<int>& sources) {
-        // visited[node] = retine daca nodul poate fi vizitat pornind
-        // dintr-o berarie
-        vector<int> visited(n + 1, 0);
-
-        // vector care retine nodurile care nu pot fi atinse pornind dintr-o taverna
-        vector<int> not_reachable;
-
-        // Step 0: declaram o coada in care putem baga noduri
-        queue<int> q;
-
-        // Step 1: pasul initial: pun in coada TOATE nodurile din berarii
-        for (int tavern : taverns) {
-            q.push(tavern);
-            visited[tavern] = true;
-        }
-
-        // Step 2: cat timp NU am parcurs toate nodurile
-        while (!q.empty()) {
-            // Step 2.1: extragem si procesam urmatorul nod din coada
-            int node = q.front();
-            q.pop();
-
-            // Step 2.2: parcurgem vecinii lui node pe graful transpus
-            for (int adj : adj_trans[node]) {
-                if (!visited[adj]) {
-                    visited[adj] = true;
-                    q.push(adj);
-                }
-            }
-        }
-
-        // Step 3: Stochez nodurile la care nu am putut ajunge
-        for (int i = 1; i <= n; ++i) {
-            if (!visited[i]) {
-                not_reachable.push_back(i);
-            }
-        }
-
-        return not_reachable;
-    }
-
-    void write_output(const vector<int>& not_reachable) {
-        ofstream fout("berarii2.out");
-        fout << not_reachable.size() << "\n";
-        for (int node : not_reachable) {
-            fout << node << "\n";
-        }
-        fout.close();
-    }
-};
-
-// [ATENTIE] NU modifica functia main!
-int main() {
-    std::unique_ptr<Task> task {new (nothrow) Task()};
-    if (!task) {
-        std::cerr << "new failed: WTF are you doing? Throw your PC!\n";
-        return -1;
-    }
-    task->solve();
-    return 0;
-}
diff --git a/algorithms/lab06/java/task-1/src/sol1_bfs.java b/algorithms/lab06/java/01-bfs/src/Bfs.java
similarity index 91%
rename from algorithms/lab06/java/task-1/src/sol1_bfs.java
rename to algorithms/lab06/java/01-bfs/src/Bfs.java
index 38f7e28..779819a 100644
--- a/algorithms/lab06/java/task-1/src/sol1_bfs.java
+++ b/algorithms/lab06/java/01-bfs/src/Bfs.java
@@ -12,7 +12,7 @@
 import java.util.Scanner;
 import java.util.Queue;
 
-public class sol1_bfs {
+public class Bfs {
     static class Task {
         public static final String INPUT_FILE = "in";
         public static final String OUTPUT_FILE = "out";
@@ -66,13 +66,6 @@ private void readInput() {
         }
  
         private int[] getResult() {
-            // TODO: Faceti un BFS care sa construiasca in d valorile:
-            // * d[node] = numarul minim de muchii de parcurs de la nodul `source` la nodul `node`
-            //      * d[source] = 0
-            //      * d[node]   = -1, daca nu exista drum de la source la node
-            // *******
-            // ATENTIE: nodurile sunt indexate de la 1 la n.
-            // *******
             return bfs(source);
         }
 
diff --git a/algorithms/lab06/java/02-dfs/src/Dfs.java b/algorithms/lab06/java/02-dfs/src/Dfs.java
new file mode 100644
index 0000000..999ed26
--- /dev/null
+++ b/algorithms/lab06/java/02-dfs/src/Dfs.java
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.Scanner;
+import java.util.ArrayList;
+
+public class Dfs {
+    static class Task {
+        public static final String INPUT_FILE = "in";
+        public static final String OUTPUT_FILE = "out";
+
+        // numarul maxim de noduri
+        public static final int NMAX = (int)1e5 + 5; // 10^5 + 5 = 100.005
+
+        // n = numar de noduri, m = numar de muchii/arce
+        int n, m;
+
+        // adj[node] = lista de adiacenta a nodului node
+        // exemplu: daca adj[node] = {..., neigh, ...} => exista muchia (node, neigh)
+        @SuppressWarnings("unchecked")
+        ArrayList<Integer> adj[] = new ArrayList[NMAX];
+
+        public void solve() {
+            readInput();
+            writeOutput(getResult());
+        }
+
+        private void readInput() {
+            try {
+                Scanner sc = new Scanner(new BufferedReader(new FileReader(
+                                INPUT_FILE)));
+                n = sc.nextInt();
+                m = sc.nextInt();
+
+                for (int node = 1; node <= n; node++) {
+                    adj[node] = new ArrayList<>();
+                }
+
+                for (int i = 1, x, y; i <= m; i++) {
+                    // muchie (x, y)
+                    x = sc.nextInt();
+                    y = sc.nextInt();
+                    adj[x].add(y);
+                    adj[y].add(x);
+                }
+
+                sc.close();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        private int getResult() {
+            return solveDfs();
+        }
+
+        // Complexitate: O(n + m)
+        private int solveDfs() {
+            int connectedComponents = 0;
+            
+            // visited[node] = 1 daca node a fost deja vizitat, 0 altfel
+            int[] visited = new int[n + 1];
+
+            // pentru fiecare nod
+            for (int node = 1; node <= n; node++) {
+                // daca nodul este nevizitat, pornim o parcurgere
+                if (visited[node] == 0) {
+                    connectedComponents++;
+                    dfs(node, visited);
+                }
+            }
+
+            return connectedComponents;
+        }
+
+        // porneste o parcurgere DFS din node
+        // foloseste vectorul visited pentru a marca nodurile vizitate
+        private void dfs(int node, int[] visited) {
+            visited[node] = 1; // marchez nodul ca fiind vizitat
+
+            // parcurg vecinii
+            for (Integer neigh : adj[node]) {
+                if (visited[neigh] == 0) {
+                    dfs(neigh, visited);
+                }
+            }
+        }
+
+        private void writeOutput(int result) {
+            try {
+                PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(
+                                OUTPUT_FILE)));
+                pw.printf("%d\n", result);
+                pw.close();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    // [ATENTIE] NU modifica functia main!
+    public static void main(String[] args) {
+        new Task().solve();
+    }
+}
diff --git a/algorithms/lab06/java/task-2/src/sol2_bfs.java b/algorithms/lab06/java/03-topsort/src/TopsortBfs.java
similarity index 94%
rename from algorithms/lab06/java/task-2/src/sol2_bfs.java
rename to algorithms/lab06/java/03-topsort/src/TopsortBfs.java
index 2efbaed..36bea32 100644
--- a/algorithms/lab06/java/task-2/src/sol2_bfs.java
+++ b/algorithms/lab06/java/03-topsort/src/TopsortBfs.java
@@ -13,7 +13,7 @@
 import java.util.Queue;
 import java.util.LinkedList;
 
-public class sol2_bfs {
+public class TopsortBfs {
     static class Task {
         public static final String INPUT_FILE = "in";
         public static final String OUTPUT_FILE = "out";
@@ -80,11 +80,6 @@ private void writeOutput(ArrayList<Integer> topsort) {
         }
 
         private ArrayList<Integer> getResult() {
-            // TODO: Faceti sortarea topologica a grafului stocat cu liste de adiacenta din adj.
-            // *******
-            // ATENTIE: nodurile sunt indexate de la 1 la n.
-            // *******
-
             return solve_bfs();
         }
 
diff --git a/algorithms/lab06/java/task-2/src/sol1_dfs.java b/algorithms/lab06/java/03-topsort/src/TopsortDfs.java
similarity index 94%
rename from algorithms/lab06/java/task-2/src/sol1_dfs.java
rename to algorithms/lab06/java/03-topsort/src/TopsortDfs.java
index b8007d2..87b31fb 100644
--- a/algorithms/lab06/java/task-2/src/sol1_dfs.java
+++ b/algorithms/lab06/java/03-topsort/src/TopsortDfs.java
@@ -10,7 +10,7 @@
 import java.util.ArrayList;
 import java.util.Collections;
 
-public class sol1_dfs {
+public class TopsortDfs {
     static class Task {
         public static final String INPUT_FILE = "in";
         public static final String OUTPUT_FILE = "out";
@@ -70,11 +70,6 @@ private void writeOutput(ArrayList<Integer> topsort) {
         }
 
         private ArrayList<Integer> getResult() {
-            // TODO: Faceti sortarea topologica a grafului stocat cu liste de adiacenta din adj.
-            // *******
-            // ATENTIE: nodurile sunt indexate de la 1 la n.
-            // *******
-
             return solveDfs();
         }
 
diff --git a/algorithms/lab06/java/task-3/src/sol1_dfs.java b/algorithms/lab06/java/task-3/src/sol1_dfs.java
deleted file mode 100644
index f5d1bca..0000000
--- a/algorithms/lab06/java/task-3/src/sol1_dfs.java
+++ /dev/null
@@ -1,144 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-
-import java.io.BufferedReader;
-import java.io.BufferedWriter;
-import java.io.FileReader;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.io.PrintWriter;
-import java.util.Scanner;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-public class sol1_dfs {
-
-    // Clasa generica pair. De exemplu, vom folosi Pair<Integer, Integer> 
-    // pentru a reprezenta o muchie catre un nod de un anumit cost.
-    private static class Pair<T, U> {
-        T first;
-        U second;
-
-        Pair(T first, U second) {
-            this.first = first;
-            this.second = second;
-        }
-    }
-
-    static class Task {
-        // numarul maxim de noduri
-        public static final int NMAX = (int)1e5 + 5; // 10^5 + 5 = 100.005
-
-        // n = numar de noduri, m = numar de muchii/arce
-        int n, m;
-
-        // adj[node] = lista de adiacenta a nodului node
-        // perechea (neigh, w) semnifica arc de la node la neigh de cost w
-        // FOLLOW-UP : Se poate o stocare mai eficienta pentru aceasta problema? 
-        // Hint: Fiecare nod are exact un vecin (putem folosi un hashtable).
-        @SuppressWarnings("unchecked")
-        ArrayList<Pair<Integer, Integer>> adj[] = new ArrayList[NMAX];
-
-        // Gradul intern al nodurilor.
-        int[] in_degree;
-
-        public void solve() {
-            readInput();
-            writeOutput(getResult());
-        }
-
-        private void readInput() {
-            Scanner sc = new Scanner(System.in);
-            n = sc.nextInt();
-            m = sc.nextInt();
-
-            in_degree = new int[n + 1];
-            
-            for (int node = 1; node <= n; node++) {
-                adj[node] = new ArrayList<>();
-            }
-
-            for (int i = 1, x, y, p; i <= m; i++) {
-                // arc (x, y)
-                x = sc.nextInt();
-                y = sc.nextInt();
-                p = sc.nextInt();
-
-                adj[x].add(new Pair<Integer,Integer>(y, p));
-                in_degree[y]++;
-            }
-        }
-
-        private void writeOutput(ArrayList<Pair<ArrayList<Integer>, Integer>> allComponents) {
-            System.out.println(allComponents.size());
-            for (Pair<ArrayList<Integer>, Integer> component : allComponents) {
-                ArrayList<Integer> nodes = component.first;
-                int cost = component.second;
-                if (nodes.size() != 1) {
-                    System.out.println(nodes.get(0) + " " + nodes.get(nodes.size() - 1) + " " + cost);
-                } else {
-                    System.out.println(nodes.get(0) + " " + nodes.get(0) + " " + cost);
-                }
-            }
-        }
-
-        private ArrayList<Pair<ArrayList<Integer>, Integer>> getResult() {
-            return solveDfs();
-        }
-
-        // Complexitate: O(n + m + n * log n): parcurgerea DFS - O(n + m), sortare - O(n log n)
-        // Observatie: Parcurgerea poate fi inlocuita si cu BFS.
-        private ArrayList<Pair<ArrayList<Integer>, Integer>> solveDfs() {
-            // vectorul rezultat, contine lanturile si costul minim pentru ele   
-            ArrayList<Pair<ArrayList<Integer>, Integer>> all_components = new ArrayList<>();
-
-            // visited[node] = 1 daca node a fost deja vizitat, 0 altfel
-            boolean[] visited = new boolean[n + 1];
-
-            // pentru fiecare nod
-            for (int node = 1; node <= n; node++) {
-                // Incepem un lant nou doar daca nodul
-                // nu e vizitat si are gradul intern 0.
-                if (!visited[node] && in_degree[node] == 0) {
-
-                    // In Java nu avem transmitere prin referinta pentru int; 
-                    // il vom pasa intr-un arrray cu un element.
-                    ArrayList<Integer> current_component = new ArrayList<>();
-                    int[] minCost = {Integer.MAX_VALUE};
-                    dfs(node, visited, current_component, minCost);
-
-                    // O componenta cu un singur nod are costul minim 0
-                    if (current_component.size() == 1) {
-                        minCost[0] = 0;
-                    }
-                    all_components.add(new Pair<>(current_component, minCost[0]));
-                }
-            }
-
-            // Sortare crescatoare dupa start
-            all_components.sort((a, b) -> Integer.compare(a.first.get(0), b.first.get(0)));
-
-            return all_components;
-        }
-
-        // porneste o parcurgere DFS din node
-        // foloseste vectorul visited pentru a marca nodurile vizitate
-        void dfs(int node, boolean[] visited, ArrayList<Integer> current_component, int[] min_cost) {
-            visited[node] = true;
-            current_component.add(node);
-
-            // parcurg vecinii
-            for (Pair<Integer, Integer> neigh : adj[node]) {
-                if (!visited[neigh.first]) {
-                    min_cost[0] = Math.min(min_cost[0], neigh.second);
-                    dfs(neigh.first, visited, current_component, min_cost);
-                }
-            }
-        }
-    }
-
-    // [ATENTIE] NU modifica functia main!
-    public static void main(String[] args) {
-        new Task().solve();
-    }
-}
diff --git a/algorithms/lab06/java/task-4/src/sol1_bfs.java b/algorithms/lab06/java/task-4/src/sol1_bfs.java
deleted file mode 100644
index 2907544..0000000
--- a/algorithms/lab06/java/task-4/src/sol1_bfs.java
+++ /dev/null
@@ -1,136 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-
-import java.io.BufferedReader;
-import java.io.BufferedWriter;
-import java.io.FileReader;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.io.PrintWriter;
-import java.util.ArrayList;
-import java.util.LinkedList;
-import java.util.Queue;
-import java.util.Scanner;
-
-public class sol1_bfs {
-    static class Task {
-        public static final String INPUT_FILE = "berarii2.in";
-        public static final String OUTPUT_FILE = "berari2.out";
-
-        // numarul maxim de noduri
-        public static final int NMAX = (int)1e5 + 5; // 10^5 + 5 = 1.000.005
-
-        // n = numar de noduri, m = numar de muchii/arce
-        int n, m;
-
-        // p = numarul de taverne
-        int p;
-
-        // adj_trans[node] = lista de adiacenta a nodului node in graful transpus
-        // exemplu: daca adj_trans[node] = {..., neigh, ...} => exista arcul (node, neigh) in graful transpus
-        @SuppressWarnings("unchecked")
-        ArrayList<Integer>[] adj_trans = new ArrayList[NMAX];
-
-        // taverns = lista de berarii
-        ArrayList<Integer> taverns = new ArrayList<>();
-
-        public void solve() {
-            readInput();
-            writeOutput(getResult());
-        }
-
-        private void readInput() {
-            try {
-                Scanner sc = new Scanner(new BufferedReader(new FileReader(INPUT_FILE)));
-                n = sc.nextInt();
-                m = sc.nextInt();
-                p = sc.nextInt();
-
-                for (int i = 0; i <= n; i++) {
-                    adj_trans[i] = new ArrayList<>();
-                }
-
-                // Stocam graful transpus, vrem sa vedem intersectiile
-                // unde nu putem ajunge pornind din berarii.
-                for (int i = 1; i <= m; i++) {
-                    int x = sc.nextInt();
-                    int y = sc.nextInt();
-                    adj_trans[y].add(x);
-                }
-
-                for (int i = 0; i < p; i++) {
-                    taverns.add(sc.nextInt());
-                }
-
-                sc.close();
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        }
-
-        ArrayList<Integer> getResult() {
-           return bfs(taverns);
-        }
-
-        // Complexitate: O(n + m)
-        ArrayList<Integer> bfs(ArrayList<Integer> sources) {
-             // visited[node] = retine daca nodul poate fi vizitat pornind
-            // dintr-o berarie
-            boolean[] visited = new boolean[n + 1];
-
-            // vector care retine nodurile care nu pot fi atinse pornind dintr-o taverna
-            ArrayList<Integer> not_reachable = new ArrayList<>();
-
-            // Step 0: declaram o coada in care putem baga noduri
-            Queue<Integer> q = new LinkedList<>();
-
-            // Step 1: pasul initial: pun in coada TOATE nodurile din berarii
-            for (int tavern : taverns) {
-                if (!visited[tavern]) {
-                    visited[tavern] = true;
-                    q.add(tavern);
-                }
-            }
-
-            // Step 2: cat timp NU am parcurs toate nodurile
-            while (!q.isEmpty()) {
-                // Step 2.1: extragem si procesam urmatorul nod din coada
-                int node = q.poll();
-
-                // Step 2.2: parcurgem vecinii lui node pe graful transpus
-                for (int neighbor : adj_trans[node]) {
-                    if (!visited[neighbor]) {
-                        visited[neighbor] = true;
-                        q.add(neighbor);
-                    }
-                }
-            }
-
-            // Step 3: Stochez nodurile la care nu am putut ajunge
-            for (int i = 1; i <= n; i++) {
-                if (!visited[i]) {
-                    not_reachable.add(i);
-                }
-            }
-
-            return not_reachable;
-        }
-
-        private void writeOutput(ArrayList<Integer> not_reachable) {
-            try {
-                PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(OUTPUT_FILE)));
-                pw.println(not_reachable.size());
-                for (int node : not_reachable) {
-                    pw.println(node);
-                }
-                pw.close();
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-
-    // [ATENTIE] NU modifica functia main!
-    public static void main(String[] args) {
-        new Task().solve();
-    }
-}
diff --git a/algorithms/lab06/python/01-bfs/01-bfs.py b/algorithms/lab06/python/01-bfs/01-bfs.py
new file mode 100644
index 0000000..2e7da5b
--- /dev/null
+++ b/algorithms/lab06/python/01-bfs/01-bfs.py
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+import sys
+from collections import deque
+
+class Task:
+    def __init__(self) -> None:
+        # n = numar de noduri, m = numar de muchii/arce
+        self.n = 0
+        self.m = 0
+        
+        # adj[node] = lista de adiacenta a nodului node
+        # exemplu: daca adj[node] = [..., neigh, ...] => exista muchia (node, neigh)
+        self.adj = []
+        
+        # nodul sursa in parcurgerea BFS
+        self.source = 0
+
+        # distanta maxima in graf
+        self.INF = int(1e9) # 10^9 = 1.000.000.000
+
+    def solve(self) -> None:
+        self.read_input()
+        self.write_output(self.get_result())
+
+    def read_input(self) -> None:
+        with open("in", "r") as fin:
+            tokens = fin.read().split()
+            if not tokens:
+                return
+            
+            self.n = int(tokens[0])
+            self.m = int(tokens[1])
+            self.source = int(tokens[2])
+            
+            self.adj = [[] for _ in range(self.n + 1)]
+            
+            idx = 3
+            for _ in range(self.m):
+                x = int(tokens[idx])
+                y = int(tokens[idx+1])
+                idx += 2
+                self.adj[x].append(y)
+                self.adj[y].append(x)
+
+    def get_result(self) -> list[int]:
+        return self.bfs(self.source)
+
+    # Complexitate: O(n + m)
+    def bfs(self, source: int) -> list[int]:
+        # Step 0: alocare vector de distante
+        # d[node] = INF, oricare ar fi node
+        d = [self.INF] * (self.n + 1)
+
+        # Step 1: declaram o coada in care putem baga noduri
+        q = deque()
+
+        # Step 2: pasul initial: pun in coada TOATE nodurile cu grad intern 0
+        q.append(source)
+        d[source] = 0
+
+        # Step 3: cat timp NU am parcurs toate nodurile
+        while q:
+            # Step 3.1: extragem si procesam urmatorul nod din coada
+            node = q.popleft()
+
+            # Step 3.2: parcurgem vecinii lui node
+            for neigh in self.adj[node]:
+                # actulizam distanta lui x fata de sursa daca
+                # am gasit o solutie mai buna
+                if d[node] + 1 < d[neigh]:
+                    # adauga nodul in coada si actualizeaza distanta pana la el
+                    d[neigh] = d[node] + 1
+                    q.append(neigh)
+
+        # Step 4: problema ne cere ca acolo unde nu exista drum sa punem -1
+        # inlocuim valorile egale cu INF din d cu -1
+        for i in range(1, self.n + 1):
+            if d[i] == self.INF:
+                d[i] = -1
+
+        return d
+
+    def write_output(self, d: list[int]) -> None:
+        with open("out", "w") as fout:
+            out_str = " ".join(map(str, d[1:self.n+1]))
+            fout.write(out_str + "\n")
+
+def main() -> None:
+    task = Task()
+    task.solve()
+
+# [ATENTIE] NU modifica functia main!
+if __name__ == "__main__":
+    main()
diff --git a/algorithms/lab06/python/02-dfs/02-dfs.py b/algorithms/lab06/python/02-dfs/02-dfs.py
new file mode 100644
index 0000000..cfe938b
--- /dev/null
+++ b/algorithms/lab06/python/02-dfs/02-dfs.py
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+import sys
+
+sys.setrecursionlimit(10**6)
+
+class Task:
+    def __init__(self) -> None:
+        # n = numar de noduri, m = numar de muchii/arce
+        self.n = 0
+        self.m = 0
+
+        # adj[node] = lista de adiacenta a nodului node
+        # exemplu: daca adj[node] = [..., neigh, ...] => exista muchia (node, neigh)
+        self.adj = []
+
+    def solve(self) -> None:
+        self.read_input()
+        self.write_output(self.get_result())
+
+    def read_input(self) -> None:
+        with open("in", "r") as fin:
+            tokens = fin.read().split()
+            if not tokens:
+                return
+
+            self.n = int(tokens[0])
+            self.m = int(tokens[1])
+
+            self.adj = [[] for _ in range(self.n + 1)]
+
+            idx = 2
+            for _ in range(self.m):
+                x = int(tokens[idx])
+                y = int(tokens[idx+1])
+                self.adj[x].append(y)
+                self.adj[y].append(x)
+                idx += 2
+
+    def get_result(self) -> int:
+        return self.solve_dfs()
+
+    # Complexitate: O(n + m)
+    def solve_dfs(self) -> int:
+        connected_components = 0
+
+        # visited[node] = 1 daca node a fost deja vizitat, 0 altfel
+        visited = [0] * (self.n + 1)
+
+        # pentru fiecare nod
+        for node in range(1, self.n + 1):
+            # daca nodul este nevizitat, pornim o parcurgere
+            if visited[node] == 0:
+                connected_components += 1
+                self.dfs(node, visited)
+
+        return connected_components
+
+    # porneste o parcurgere DFS din node
+    # foloseste vectorul visited pentru a marca nodurile vizitate
+    def dfs(self, node: int, visited: list[int]) -> None:
+        visited[node] = 1 # marchez nodul ca fiind vizitat
+
+        # parcurg vecinii
+        for neigh in self.adj[node]:
+            if visited[neigh] == 0:
+                self.dfs(neigh, visited)
+
+    def write_output(self, result: int) -> None:
+        with open("out", "w") as fout:
+            fout.write(f"{result}\n")
+
+def main() -> None:
+    task = Task()
+    task.solve()
+
+# [ATENTIE] NU modifica functia main!
+if __name__ == "__main__":
+    main()
diff --git a/algorithms/lab06/python/03-topsort/03-topsort_bfs.py b/algorithms/lab06/python/03-topsort/03-topsort_bfs.py
new file mode 100644
index 0000000..5305947
--- /dev/null
+++ b/algorithms/lab06/python/03-topsort/03-topsort_bfs.py
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+import sys
+from collections import deque
+
+class Task:
+    def __init__(self) -> None:
+        # n = numar de noduri, m = numar de muchii/arce
+        self.n = 0
+        self.m = 0
+
+        # adj[node] = lista de adiacenta a nodului node
+        # exemplu: daca adj[node] = [..., neigh, ...] => exista arcul (node, neigh)
+        self.adj = []
+
+        # in_degree[node] = gradul intern al nodului node
+        self.in_degree = []
+
+    def solve(self) -> None:
+        self.read_input()
+        self.write_output(self.get_result())
+
+    def read_input(self) -> None:
+        with open("in", "r") as fin:
+            tokens = fin.read().split()
+            if not tokens:
+                return
+
+            self.n = int(tokens[0])
+            self.m = int(tokens[1])
+
+            self.adj = [[] for _ in range(self.n + 1)]
+            # grad intern 0 pentru toate nodurile... momentan
+            self.in_degree = [0] * (self.n + 1)
+
+            idx = 2
+            for _ in range(self.m):
+                x = int(tokens[idx])
+                y = int(tokens[idx+1])
+                self.adj[x].append(y) # arc (x, y)
+                self.in_degree[y] += 1 # numar inca o muchie care intra in y
+                idx += 2
+
+    def get_result(self) -> list[int]:
+        return self.solve_bfs()
+
+    # Complexitate: O(n + m)
+    def solve_bfs(self) -> list[int]:
+        # Step 0: initializare topsort - permutare vida initial
+        topsort = []
+
+        # Step 1: declaram o coada in care putem baga noduri
+        q = deque()
+
+        # Step 2: pasul initial: pun in coada TOATE nodurile cu grad intern 0
+        for node in range(1, self.n + 1):
+            if self.in_degree[node] == 0:
+                q.append(node)
+
+        # in_degree il modificam, deci facem o copie
+        in_degree = list(self.in_degree)
+
+        # Step 3: parcurg in latime graful
+        while q:
+            # 3.1: SCOT primul nod din coada
+            # adaug la solutie elementul scos
+            node = q.popleft()
+            topsort.append(node)
+
+            # 3.2 Ii parcurg toti vecinii
+            for neigh in self.adj[node]:
+                # sterg muchia node->neigh
+                # obs1. NU e nevoie sa o sterg la propriu
+                #       Daca nu am cicluri, nu se va ajunge aici
+                # obs2. Simulez stergerea prin scaderea gradului intern a lui neigh
+                in_degree[neigh] -= 1
+
+                # daca neigh a ajuns nod cu grad intern 0, atunci este adaugat in coada
+                if in_degree[neigh] == 0:
+                    q.append(neigh)
+
+        # Step 4: verifica ca topsort chiar reprezinta o sortare topologica valida
+        # Ce inseamna asta? S-au sters toate muchiile din graf.
+        # Daca nu s-a sters tot, atunci graful este ciclic!
+        is_valid = all(d == 0 for d in in_degree[1:self.n+1])
+        if is_valid:
+            return topsort # sortarea topologica obtinuta
+        else:
+            return [] # vector gol == nu se poate face o sortare topologica
+
+    def write_output(self, topsort: list[int]) -> None:
+        with open("out", "w") as fout:
+            out_str = " ".join(map(str, topsort))
+            fout.write(out_str + "\n")
+
+def main() -> None:
+    task = Task()
+    task.solve()
+
+# [ATENTIE] NU modifica functia main!
+if __name__ == "__main__":
+    main()
diff --git a/algorithms/lab06/python/03-topsort/03-topsort_dfs.py b/algorithms/lab06/python/03-topsort/03-topsort_dfs.py
new file mode 100644
index 0000000..3b54e50
--- /dev/null
+++ b/algorithms/lab06/python/03-topsort/03-topsort_dfs.py
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+import sys
+
+sys.setrecursionlimit(10**6)
+
+class Task:
+    def __init__(self) -> None:
+        # n = numar de noduri, m = numar de muchii/arce
+        self.n = 0
+        self.m = 0
+
+        # adj[node] = lista de adiacenta a nodului node
+        # exemplu: daca adj[node] = [..., neigh, ...] => exista arcul (node, neigh)
+        self.adj = []
+
+    def solve(self) -> None:
+        self.read_input()
+        self.write_output(self.get_result())
+
+    def read_input(self) -> None:
+        with open("in", "r") as fin:
+            tokens = fin.read().split()
+            if not tokens:
+                return
+
+            self.n = int(tokens[0])
+            self.m = int(tokens[1])
+
+            self.adj = [[] for _ in range(self.n + 1)]
+
+            idx = 2
+            for _ in range(self.m):
+                x = int(tokens[idx])
+                y = int(tokens[idx+1])
+                self.adj[x].append(y)
+                idx += 2
+
+    def get_result(self) -> list[int]:
+        return self.solve_dfs()
+
+    # Complexitate: O(n + m)
+    def solve_dfs(self) -> list[int]:
+        # vectorul rezultat (in final contine o permutare pentru 1, 2, ..., n)
+        topsort = []
+
+        # visited[node] = 1 daca node a fost deja vizitat, 0 altfel
+        visited = [0] * (self.n + 1)
+
+        # pentru fiecare nod
+        for node in range(1, self.n + 1):
+            # daca nodul este nevizitat, pornim o parcurgere
+            if visited[node] == 0:
+                self.dfs(node, visited, topsort)
+
+        # rezultatul a fost obtinut in ordine inversa
+        topsort.reverse()
+
+        return topsort
+
+    # porneste o parcurgere DFS din node
+    # foloseste vectorul visited pentru a marca nodurile vizitate
+    def dfs(self, node: int, visited: list[int], topsort: list[int]) -> None:
+        visited[node] = 1 # marchez nodul ca fiind vizitat
+
+        # parcurg vecinii
+        for neigh in self.adj[node]:
+            if visited[neigh] == 0:
+                self.dfs(neigh, visited, topsort)
+
+        # dupa ce am vizitat recursiv toti vecinii, adaugam
+        # nodul la sortare
+        topsort.append(node)
+
+    def write_output(self, topsort: list[int]) -> None:
+        with open("out", "w") as fout:
+            out_str = " ".join(map(str, topsort))
+            fout.write(out_str + "\n")
+
+def main() -> None:
+    task = Task()
+    task.solve()
+
+# [ATENTIE] NU modifica functia main!
+if __name__ == "__main__":
+    main()
diff --git a/algorithms/lab06/rust/01-bfs/01-bfs.rs b/algorithms/lab06/rust/01-bfs/01-bfs.rs
new file mode 100644
index 0000000..8803e33
--- /dev/null
+++ b/algorithms/lab06/rust/01-bfs/01-bfs.rs
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+use std::collections::VecDeque;
+use std::fs::File;
+use std::io::{BufRead, BufReader, Write};
+
+#[derive(Default)]
+struct Task {
+    // n = numar de noduri, m = numar de muchii/arce
+    n: i32,
+    m: i32,
+
+    // adj[node] = lista de adiacenta a nodului node
+    // exemplu: daca adj[node] = {..., neigh, ...} => exista muchia (node, neigh)
+    adj: Vec<Vec<i32>>,
+
+    // nodul sursa in parcurgerea BFS
+    source: i32,
+}
+
+impl Task {
+    // numarul maxim de noduri
+    const NMAX: usize = 100_005; // 10^5 + 5
+
+    // distanta maxima in graf
+    const INF: i32 = 1_000_000_000; // 10^9
+
+    pub fn solve(&mut self) {
+        self.read_input();
+        self.write_output(&self.get_result());
+    }
+
+    fn read_input(&mut self) {
+        let fin = File::open("in").expect("in");
+        let mut lines = BufReader::new(fin).lines().map(|l| l.unwrap());
+        let first = lines.next().unwrap();
+        let mut tokens = first.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+        self.n = tokens.next().unwrap();
+        self.m = tokens.next().unwrap();
+        self.source = tokens.next().unwrap();
+        self.adj = vec![vec![]; Self::NMAX];
+        for _ in 0..self.m {
+            let line = lines.next().unwrap();
+            let mut tok = line.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+            let x = tok.next().unwrap();
+            let y = tok.next().unwrap();
+            // muchie (x, y)
+            self.adj[x as usize].push(y);
+            self.adj[y as usize].push(x);
+        }
+    }
+
+    fn get_result(&self) -> Vec<i32> {
+        return self.bfs(self.source);
+    }
+
+    // Complexitate: O(n + m)
+    fn bfs(&self, source: i32) -> Vec<i32> {
+        // Step 0: alocare vector de distante
+        // d[node] = INF, oricare ar fi node
+        let mut d = vec![Self::INF; (self.n + 1) as usize];
+
+        // Step 1: declaram o coada in care putem baga noduri
+        let mut q = VecDeque::new();
+
+        // Step 2: pasul initial: pun in coada TOATE nodurile cu grad intern 0
+        q.push_back(source);
+        d[source as usize] = 0;
+
+        // Step 3: cat timp NU am parcurs toate nodurile
+        while let Some(node) = q.pop_front() {
+            // Step 3.1: extragem si procesam urmatorul nod din coada
+            // Step 3.2: parcurgem vecinii lui node
+            for &neigh in &self.adj[node as usize] {
+                // actualizam distanta lui neigh fata de sursa daca
+                // am gasit o solutie mai buna
+                if d[node as usize] + 1 < d[neigh as usize] {
+                    // adauga nodul in coada si actualizeaza distanta pana la el
+                    d[neigh as usize] = d[node as usize] + 1;
+                    q.push_back(neigh);
+                }
+            }
+        }
+
+        // Step 4: problema ne cere ca acolo unde nu exista drum sa punem -1
+        // inlocuim valorile egale cu INF din d cu -1
+        for value in &mut d {
+            if *value == Self::INF {
+                *value = -1;
+            }
+        }
+
+        return d;
+    }
+
+    fn write_output(&self, d: &[i32]) {
+        let mut fout = File::create("out").expect("out");
+        for node in 1..=self.n {
+            let idx = node as usize;
+            if node == self.n {
+                writeln!(fout, "{}", d[idx]).unwrap();
+            } else {
+                write!(fout, "{} ", d[idx]).unwrap();
+            }
+        }
+    }
+}
+
+// [ATENTIE] NU modifica functia main!
+fn main() {
+    let mut task = Box::new(Task::default());
+    task.solve();
+}
diff --git a/algorithms/lab06/rust/02-dfs/02-dfs.rs b/algorithms/lab06/rust/02-dfs/02-dfs.rs
new file mode 100644
index 0000000..dc1d110
--- /dev/null
+++ b/algorithms/lab06/rust/02-dfs/02-dfs.rs
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+use std::fs::File;
+use std::io::{BufRead, BufReader, Write};
+
+#[derive(Default)]
+struct Task {
+    // n = numar de noduri, m = numar de muchii/arce
+    n: i32,
+    m: i32,
+
+    // adj[node] = lista de adiacenta a nodului node
+    // exemplu: daca adj[node] = {..., neigh, ...} => exista muchia (node, neigh)
+    adj: Vec<Vec<i32>>,
+}
+
+impl Task {
+    // numarul maxim de noduri
+    const NMAX: usize = 100_005; // 10^5 + 5
+
+    pub fn solve(&mut self) {
+        self.read_input();
+        self.write_output(self.get_result());
+    }
+
+    fn read_input(&mut self) {
+        let fin = File::open("in").expect("in");
+        let mut lines = BufReader::new(fin).lines().map(|l| l.unwrap());
+        let first = lines.next().unwrap();
+        let mut tokens = first.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+        self.n = tokens.next().unwrap();
+        self.m = tokens.next().unwrap();
+        self.adj = vec![vec![]; Self::NMAX];
+        for _ in 0..self.m {
+            let line = lines.next().unwrap();
+            let mut tok = line.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+            let x = tok.next().unwrap();
+            let y = tok.next().unwrap();
+            // muchie (x, y)
+            self.adj[x as usize].push(y);
+            self.adj[y as usize].push(x);
+        }
+    }
+
+    fn get_result(&self) -> i32 {
+        return self.solve_dfs();
+    }
+
+    // Complexitate: O(n + m)
+    fn solve_dfs(&self) -> i32 {
+        let mut connected_components = 0;
+
+        // visited[node] = 1 daca node a fost deja vizitat, 0 altfel
+        let mut visited = vec![0; (self.n + 1) as usize];
+
+        // pentru fiecare nod
+        for node in 1..=self.n {
+            // daca nodul este nevizitat, pornim o parcurgere
+            if visited[node as usize] == 0 {
+                connected_components += 1;
+                self.dfs(node, &mut visited);
+            }
+        }
+
+        return connected_components;
+    }
+
+    // porneste o parcurgere DFS din node
+    // foloseste vectorul visited pentru a marca nodurile vizitate
+    fn dfs(&self, node: i32, visited: &mut [i32]) {
+        visited[node as usize] = 1; // marchez nodul ca fiind vizitat
+
+        // parcurg vecinii
+        for &neigh in &self.adj[node as usize] {
+            if visited[neigh as usize] == 0 {
+                self.dfs(neigh, visited);
+            }
+        }
+    }
+
+    fn write_output(&self, result: i32) {
+        let mut fout = File::create("out").expect("out");
+        writeln!(fout, "{}", result).unwrap();
+    }
+}
+
+// [ATENTIE] NU modifica functia main!
+fn main() {
+    let mut task = Box::new(Task::default());
+    task.solve();
+}
diff --git a/algorithms/lab06/rust/03-topsort/03-topsort_bfs.rs b/algorithms/lab06/rust/03-topsort/03-topsort_bfs.rs
new file mode 100644
index 0000000..8f77066
--- /dev/null
+++ b/algorithms/lab06/rust/03-topsort/03-topsort_bfs.rs
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+use std::collections::VecDeque;
+use std::fs::File;
+use std::io::{BufRead, BufReader, Write};
+
+#[derive(Default)]
+struct Task {
+    // n = numar de noduri, m = numar de muchii/arce
+    n: i32,
+    m: i32,
+
+    // adj[node] = lista de adiacenta a nodului node
+    // exemplu: daca adj[node] = {..., neigh, ...} => exista arcul (node, neigh)
+    adj: Vec<Vec<i32>>,
+
+    // in_degree[node] = gradul intern al nodului node
+    in_degree: Vec<i32>,
+}
+
+impl Task {
+    // numarul maxim de noduri
+    const NMAX: usize = 100_005; // 10^5 + 5
+
+    pub fn solve(&mut self) {
+        self.read_input();
+        self.write_output(&self.get_result());
+    }
+
+    fn read_input(&mut self) {
+        let fin = File::open("in").expect("in");
+        let mut lines = BufReader::new(fin).lines().map(|l| l.unwrap());
+        let first = lines.next().unwrap();
+        let mut tokens = first.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+        self.n = tokens.next().unwrap();
+        self.m = tokens.next().unwrap();
+
+        self.adj = vec![vec![]; Self::NMAX];
+        // grad intern 0 pentru toate nodurile... momentan
+        self.in_degree = vec![0; (self.n + 1) as usize];
+
+        for _ in 0..self.m {
+            let line = lines.next().unwrap();
+            let mut tok = line.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+            let x = tok.next().unwrap();
+            let y = tok.next().unwrap();
+            self.adj[x as usize].push(y); // arc (x, y)
+            self.in_degree[y as usize] += 1; // numar inca o muchie care intra in y
+        }
+    }
+
+    fn get_result(&self) -> Vec<i32> {
+        return self.solve_bfs();
+    }
+
+    // Complexitate: O(n + m)
+    fn solve_bfs(&self) -> Vec<i32> {
+        // Step 0: initializare topsort - permutare vida initial
+        let mut topsort: Vec<i32> = vec![];
+
+        // Step 1: declaram o coada in care putem baga noduri
+        let mut q = VecDeque::new();
+
+        // Step 2: pasul initial: pun in coada TOATE nodurile cu grad intern 0
+        for node in 1..=self.n {
+            if self.in_degree[node as usize] == 0 {
+                q.push_back(node);
+            }
+        }
+
+        // in_degree il modificam, deci trebuie mutabil
+        let mut in_degree = self.in_degree.clone();
+
+        // Step 3: parcurg in latime graful
+        while let Some(node) = q.pop_front() {
+            // 3.1: SCOT primul nod din coada
+            // adaug la solutie elementul scos
+            topsort.push(node);
+
+            // 3.2 Ii parcurg toti vecinii
+            for &neigh in &self.adj[node as usize] {
+                // sterg muchia node->neigh
+                // obs1. NU e nevoie sa o sterg la propriu
+                //       Daca nu am cicluri, nu se va ajunge aici
+                // obs2. Simulez stergerea prin scaderea gradului intern a lui neigh
+                in_degree[neigh as usize] -= 1;
+
+                // daca neigh a ajuns nod cu grad intern 0, atunci este adaugat in coada
+                if in_degree[neigh as usize] == 0 {
+                    q.push_back(neigh);
+                }
+            }
+        }
+
+        // Step 4: verifica ca topsort chiar reprezinta o sortare topologica valida
+        // Ce inseamna asta? S-au sters toate muchiile din graf.
+        // Daca nu s-a sters tot, atunci graful este ciclic!
+        let is_valid = in_degree[1usize..=self.n as usize].iter().all(|&d| d == 0);
+        if is_valid {
+            return topsort; // sortarea topologica obtinuta
+        } else {
+            return vec![]; // vector gol == nu se poate face o sortare topologica
+        }
+    }
+
+    fn write_output(&self, topsort: &[i32]) {
+        let mut fout = File::create("out").expect("out");
+        for node in topsort {
+            write!(fout, "{} ", node).unwrap();
+        }
+        writeln!(fout).unwrap();
+    }
+}
+
+// [ATENTIE] NU modifica functia main!
+fn main() {
+    let mut task = Box::new(Task::default());
+    task.solve();
+}
diff --git a/algorithms/lab06/rust/03-topsort/03-topsort_dfs.rs b/algorithms/lab06/rust/03-topsort/03-topsort_dfs.rs
new file mode 100644
index 0000000..1db49fb
--- /dev/null
+++ b/algorithms/lab06/rust/03-topsort/03-topsort_dfs.rs
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+use std::fs::File;
+use std::io::{BufRead, BufReader, Write};
+
+#[derive(Default)]
+struct Task {
+    // n = numar de noduri, m = numar de muchii/arce
+    n: i32,
+    m: i32,
+
+    // adj[node] = lista de adiacenta a nodului node
+    // exemplu: daca adj[node] = {..., neigh, ...} => exista arcul (node, neigh)
+    adj: Vec<Vec<i32>>,
+}
+
+impl Task {
+    // numarul maxim de noduri
+    const NMAX: usize = 100_005; // 10^5 + 5
+
+    pub fn solve(&mut self) {
+        self.read_input();
+        self.write_output(&self.get_result());
+    }
+
+    fn read_input(&mut self) {
+        let fin = File::open("in").expect("in");
+        let mut lines = BufReader::new(fin).lines().map(|l| l.unwrap());
+        let first = lines.next().unwrap();
+        let mut tokens = first.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+        self.n = tokens.next().unwrap();
+        self.m = tokens.next().unwrap();
+        self.adj = vec![vec![]; Self::NMAX];
+        for _ in 0..self.m {
+            let line = lines.next().unwrap();
+            let mut tok = line.split_whitespace().map(|s| s.parse::<i32>().unwrap());
+            let x = tok.next().unwrap();
+            let y = tok.next().unwrap();
+            // arc (x, y)
+            self.adj[x as usize].push(y);
+        }
+    }
+
+    fn get_result(&self) -> Vec<i32> {
+        return self.solve_dfs();
+    }
+
+    // Complexitate: O(n + m)
+    fn solve_dfs(&self) -> Vec<i32> {
+        // vectorul rezultat (in final contine o permutare pentru 1, 2, ..., n)
+        let mut topsort: Vec<i32> = vec![];
+
+        // visited[node] = 1 daca node a fost deja vizitat, 0 altfel
+        let mut visited = vec![0; (self.n + 1) as usize];
+
+        // pentru fiecare nod
+        for node in 1..=self.n {
+            // daca nodul este nevizitat, pornim o parcurgere
+            if visited[node as usize] == 0 {
+                self.dfs(node, &mut visited, &mut topsort);
+            }
+        }
+
+        // rezultatul a fost obtinut in ordine inversa
+        topsort.reverse();
+
+        return topsort;
+    }
+
+    // porneste o parcurgere DFS din node
+    // foloseste vectorul visited pentru a marca nodurile vizitate
+    fn dfs(&self, node: i32, visited: &mut [i32], topsort: &mut Vec<i32>) {
+        visited[node as usize] = 1; // marchez nodul ca fiind vizitat
+
+        // parcurg vecinii
+        for &neigh in &self.adj[node as usize] {
+            if visited[neigh as usize] == 0 {
+                self.dfs(neigh, visited, topsort);
+            }
+        }
+
+        // dupa ce am vizitat recursiv toti vecinii, adaugam
+        // nodul la sortare
+        topsort.push(node);
+    }
+
+    fn write_output(&self, topsort: &[i32]) {
+        let mut fout = File::create("out").expect("out");
+        for node in topsort {
+            write!(fout, "{} ", node).unwrap();
+        }
+        writeln!(fout).unwrap();
+    }
+}
+
+// [ATENTIE] NU modifica functia main!
+fn main() {
+    let mut task = Box::new(Task::default());
+    task.solve();
+}
diff --git a/algorithms/lab06/tests/task-1/1.in b/algorithms/lab06/tests/01-bfs/1.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/1.in
rename to algorithms/lab06/tests/01-bfs/1.in
diff --git a/algorithms/lab06/tests/task-1/1.ref b/algorithms/lab06/tests/01-bfs/1.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/1.ref
rename to algorithms/lab06/tests/01-bfs/1.ref
diff --git a/algorithms/lab06/tests/task-1/10.in b/algorithms/lab06/tests/01-bfs/10.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/10.in
rename to algorithms/lab06/tests/01-bfs/10.in
diff --git a/algorithms/lab06/tests/task-1/10.ref b/algorithms/lab06/tests/01-bfs/10.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/10.ref
rename to algorithms/lab06/tests/01-bfs/10.ref
diff --git a/algorithms/lab06/tests/task-1/2.in b/algorithms/lab06/tests/01-bfs/2.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/2.in
rename to algorithms/lab06/tests/01-bfs/2.in
diff --git a/algorithms/lab06/tests/task-1/2.ref b/algorithms/lab06/tests/01-bfs/2.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/2.ref
rename to algorithms/lab06/tests/01-bfs/2.ref
diff --git a/algorithms/lab06/tests/task-1/3.in b/algorithms/lab06/tests/01-bfs/3.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/3.in
rename to algorithms/lab06/tests/01-bfs/3.in
diff --git a/algorithms/lab06/tests/task-1/3.ref b/algorithms/lab06/tests/01-bfs/3.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/3.ref
rename to algorithms/lab06/tests/01-bfs/3.ref
diff --git a/algorithms/lab06/tests/task-1/4.in b/algorithms/lab06/tests/01-bfs/4.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/4.in
rename to algorithms/lab06/tests/01-bfs/4.in
diff --git a/algorithms/lab06/tests/task-1/4.ref b/algorithms/lab06/tests/01-bfs/4.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/4.ref
rename to algorithms/lab06/tests/01-bfs/4.ref
diff --git a/algorithms/lab06/tests/task-1/5.in b/algorithms/lab06/tests/01-bfs/5.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/5.in
rename to algorithms/lab06/tests/01-bfs/5.in
diff --git a/algorithms/lab06/tests/task-1/5.ref b/algorithms/lab06/tests/01-bfs/5.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/5.ref
rename to algorithms/lab06/tests/01-bfs/5.ref
diff --git a/algorithms/lab06/tests/task-1/6.in b/algorithms/lab06/tests/01-bfs/6.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/6.in
rename to algorithms/lab06/tests/01-bfs/6.in
diff --git a/algorithms/lab06/tests/task-1/6.ref b/algorithms/lab06/tests/01-bfs/6.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/6.ref
rename to algorithms/lab06/tests/01-bfs/6.ref
diff --git a/algorithms/lab06/tests/task-1/7.in b/algorithms/lab06/tests/01-bfs/7.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/7.in
rename to algorithms/lab06/tests/01-bfs/7.in
diff --git a/algorithms/lab06/tests/task-1/7.ref b/algorithms/lab06/tests/01-bfs/7.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/7.ref
rename to algorithms/lab06/tests/01-bfs/7.ref
diff --git a/algorithms/lab06/tests/task-1/8.in b/algorithms/lab06/tests/01-bfs/8.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/8.in
rename to algorithms/lab06/tests/01-bfs/8.in
diff --git a/algorithms/lab06/tests/task-1/8.ref b/algorithms/lab06/tests/01-bfs/8.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/8.ref
rename to algorithms/lab06/tests/01-bfs/8.ref
diff --git a/algorithms/lab06/tests/task-1/9.in b/algorithms/lab06/tests/01-bfs/9.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/9.in
rename to algorithms/lab06/tests/01-bfs/9.in
diff --git a/algorithms/lab06/tests/task-1/9.ref b/algorithms/lab06/tests/01-bfs/9.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/9.ref
rename to algorithms/lab06/tests/01-bfs/9.ref
diff --git a/algorithms/lab06/tests/01-bfs/check_task b/algorithms/lab06/tests/01-bfs/check_task
new file mode 100755
index 0000000..cb49b8e
--- /dev/null
+++ b/algorithms/lab06/tests/01-bfs/check_task
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: BSD-3-Clause
+
+diff -q --ignore-all-space "$2" "$3" &>/dev/null
diff --git a/algorithms/lab06/tests/task-1/custom.in b/algorithms/lab06/tests/01-bfs/custom.in
similarity index 100%
rename from algorithms/lab06/tests/task-1/custom.in
rename to algorithms/lab06/tests/01-bfs/custom.in
diff --git a/algorithms/lab06/tests/task-1/custom.ref b/algorithms/lab06/tests/01-bfs/custom.ref
similarity index 100%
rename from algorithms/lab06/tests/task-1/custom.ref
rename to algorithms/lab06/tests/01-bfs/custom.ref
diff --git a/algorithms/lab06/tests/02-dfs/1.in b/algorithms/lab06/tests/02-dfs/1.in
new file mode 100644
index 0000000..93514ad
--- /dev/null
+++ b/algorithms/lab06/tests/02-dfs/1.in
@@ -0,0 +1,26 @@
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diff --git a/algorithms/lab06/tests/02-dfs/1.ref b/algorithms/lab06/tests/02-dfs/1.ref
new file mode 100644
index 0000000..6f4247a
--- /dev/null
+++ b/algorithms/lab06/tests/02-dfs/1.ref
@@ -0,0 +1 @@
+26
diff --git a/algorithms/lab06/tests/02-dfs/10.in b/algorithms/lab06/tests/02-dfs/10.in
new file mode 100644
index 0000000..2ef096f
--- /dev/null
+++ b/algorithms/lab06/tests/02-dfs/10.in
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new file mode 100644
index 0000000..d00491f
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diff --git a/algorithms/lab06/tests/02-dfs/6.ref b/algorithms/lab06/tests/02-dfs/6.ref
new file mode 100644
index 0000000..3bc92d4
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new file mode 100644
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new file mode 100644
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diff --git a/algorithms/lab06/tests/02-dfs/8.ref b/algorithms/lab06/tests/02-dfs/8.ref
new file mode 100644
index 0000000..b4de394
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+++ b/algorithms/lab06/tests/02-dfs/8.ref
@@ -0,0 +1 @@
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diff --git a/algorithms/lab06/tests/02-dfs/9.in b/algorithms/lab06/tests/02-dfs/9.in
new file mode 100644
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diff --git a/algorithms/lab06/tests/02-dfs/9.ref b/algorithms/lab06/tests/02-dfs/9.ref
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ b/algorithms/lab06/tests/02-dfs/9.ref
@@ -0,0 +1 @@
+3
diff --git a/algorithms/lab06/tests/02-dfs/check_task b/algorithms/lab06/tests/02-dfs/check_task
new file mode 100755
index 0000000..cb49b8e
--- /dev/null
+++ b/algorithms/lab06/tests/02-dfs/check_task
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: BSD-3-Clause
+
+diff -q --ignore-all-space "$2" "$3" &>/dev/null
diff --git a/algorithms/lab06/tests/task-2/custom.in b/algorithms/lab06/tests/02-dfs/custom.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/custom.in
rename to algorithms/lab06/tests/02-dfs/custom.in
diff --git a/algorithms/lab06/tests/task-2/custom.ref b/algorithms/lab06/tests/02-dfs/custom.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/custom.ref
rename to algorithms/lab06/tests/02-dfs/custom.ref
diff --git a/algorithms/lab06/tests/task-2/1.in b/algorithms/lab06/tests/03-topsort/1.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/1.in
rename to algorithms/lab06/tests/03-topsort/1.in
diff --git a/algorithms/lab06/tests/task-2/1.ref b/algorithms/lab06/tests/03-topsort/1.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/1.ref
rename to algorithms/lab06/tests/03-topsort/1.ref
diff --git a/algorithms/lab06/tests/task-2/10.in b/algorithms/lab06/tests/03-topsort/10.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/10.in
rename to algorithms/lab06/tests/03-topsort/10.in
diff --git a/algorithms/lab06/tests/task-2/10.ref b/algorithms/lab06/tests/03-topsort/10.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/10.ref
rename to algorithms/lab06/tests/03-topsort/10.ref
diff --git a/algorithms/lab06/tests/task-2/2.in b/algorithms/lab06/tests/03-topsort/2.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/2.in
rename to algorithms/lab06/tests/03-topsort/2.in
diff --git a/algorithms/lab06/tests/task-2/2.ref b/algorithms/lab06/tests/03-topsort/2.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/2.ref
rename to algorithms/lab06/tests/03-topsort/2.ref
diff --git a/algorithms/lab06/tests/task-2/3.in b/algorithms/lab06/tests/03-topsort/3.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/3.in
rename to algorithms/lab06/tests/03-topsort/3.in
diff --git a/algorithms/lab06/tests/task-2/3.ref b/algorithms/lab06/tests/03-topsort/3.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/3.ref
rename to algorithms/lab06/tests/03-topsort/3.ref
diff --git a/algorithms/lab06/tests/task-2/4.in b/algorithms/lab06/tests/03-topsort/4.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/4.in
rename to algorithms/lab06/tests/03-topsort/4.in
diff --git a/algorithms/lab06/tests/task-2/4.ref b/algorithms/lab06/tests/03-topsort/4.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/4.ref
rename to algorithms/lab06/tests/03-topsort/4.ref
diff --git a/algorithms/lab06/tests/task-2/5.in b/algorithms/lab06/tests/03-topsort/5.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/5.in
rename to algorithms/lab06/tests/03-topsort/5.in
diff --git a/algorithms/lab06/tests/task-2/5.ref b/algorithms/lab06/tests/03-topsort/5.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/5.ref
rename to algorithms/lab06/tests/03-topsort/5.ref
diff --git a/algorithms/lab06/tests/task-2/6.in b/algorithms/lab06/tests/03-topsort/6.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/6.in
rename to algorithms/lab06/tests/03-topsort/6.in
diff --git a/algorithms/lab06/tests/task-2/6.ref b/algorithms/lab06/tests/03-topsort/6.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/6.ref
rename to algorithms/lab06/tests/03-topsort/6.ref
diff --git a/algorithms/lab06/tests/task-2/7.in b/algorithms/lab06/tests/03-topsort/7.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/7.in
rename to algorithms/lab06/tests/03-topsort/7.in
diff --git a/algorithms/lab06/tests/task-2/7.ref b/algorithms/lab06/tests/03-topsort/7.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/7.ref
rename to algorithms/lab06/tests/03-topsort/7.ref
diff --git a/algorithms/lab06/tests/task-2/8.in b/algorithms/lab06/tests/03-topsort/8.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/8.in
rename to algorithms/lab06/tests/03-topsort/8.in
diff --git a/algorithms/lab06/tests/task-2/8.ref b/algorithms/lab06/tests/03-topsort/8.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/8.ref
rename to algorithms/lab06/tests/03-topsort/8.ref
diff --git a/algorithms/lab06/tests/task-2/9.in b/algorithms/lab06/tests/03-topsort/9.in
similarity index 100%
rename from algorithms/lab06/tests/task-2/9.in
rename to algorithms/lab06/tests/03-topsort/9.in
diff --git a/algorithms/lab06/tests/task-2/9.ref b/algorithms/lab06/tests/03-topsort/9.ref
similarity index 100%
rename from algorithms/lab06/tests/task-2/9.ref
rename to algorithms/lab06/tests/03-topsort/9.ref
diff --git a/algorithms/lab06/tests/task-2/check_task b/algorithms/lab06/tests/03-topsort/check_task
similarity index 100%
rename from algorithms/lab06/tests/task-2/check_task
rename to algorithms/lab06/tests/03-topsort/check_task
diff --git a/algorithms/lab06/tests/03-topsort/custom.in b/algorithms/lab06/tests/03-topsort/custom.in
new file mode 100644
index 0000000..e69de29
diff --git a/algorithms/lab06/tests/03-topsort/custom.ref b/algorithms/lab06/tests/03-topsort/custom.ref
new file mode 100644
index 0000000..e69de29
diff --git a/algorithms/lab06/tests/task-1/check_task b/algorithms/lab06/tests/task-1/check_task
deleted file mode 120000
index 83089a8..0000000
--- a/algorithms/lab06/tests/task-1/check_task
+++ /dev/null
@@ -1 +0,0 @@
-../../../../utils/default_checker.sh
\ No newline at end of file