Kattis: City Bike

Author: Macesuted

Kattis/citybike.cpp

@@ -0,0 +1,84 @@
+/**
+ * @file citybike.cpp
+ * @author Macesuted ([email protected])
+ * @date 2025-11-01
+ *
+ * @copyright Copyright (c) 2025
+ *
+ */
+
+#include <bits/stdc++.h>
+using namespace std;
+
+#ifndef LOCAL
+#define endl '\n'
+#endif
+
+bool mem1;
+
+#define maxn 200005
+
+int a[maxn];
+
+void solve(void) {
+    int n, d, c;
+    cin >> n >> d >> c;
+    for (int i = 1; i <= n; i++) cin >> a[i];
+
+    int l = 0, r = d + 1;
+    while (l + 1 < r) {
+        int mid = (l + r) >> 1;
+
+        auto chk = [&](int lim) -> bool {
+            for (int i = 1, sum = 0; i <= n; i++) {
+                sum += a[i] - lim;
+                if (sum > 0) sum = 0;
+                if (sum < -c) return false;
+            }
+
+            return true;
+        };
+
+        (chk(mid) ? l : r) = mid;
+    }
+    int L = l;
+
+    l = -1, r = d;
+    while (l + 1 < r) {
+        int mid = (l + r) >> 1;
+
+        auto chk = [&](int lim) -> bool {
+            for (int i = 1, sum = 0; i <= n; i++) {
+                sum += lim - a[i];
+                if (sum > 0) sum = 0;
+                if (sum < -c) return false;
+            }
+
+            return true;
+        };
+
+        (chk(mid) ? r : l) = mid;
+    }
+    int R = r;
+
+    cout << max(0, R - L) << endl;
+
+    return;
+}
+
+bool mem2;
+
+int main() {
+    ios::sync_with_stdio(false), cin.tie(nullptr);
+#ifdef LOCAL
+    cerr << "Memory Cost: " << abs(&mem1 - &mem2) / 1024. / 1024. << "MB" << endl;
+#endif
+
+    int _ = 1;
+    while (_--) solve();
+
+#ifdef LOCAL
+    cerr << "Time Cost: " << clock() * 1000. / CLOCKS_PER_SEC << "MS" << endl;
+#endif
+    return 0;
+}

README.md

@@ -19,6 +19,7 @@ My accounts on these online judge platforms:
 - (Private) HEZOJ: Macesuted
 - (Private) HLOJ: Macesuted
 - [HydroOJ](https://hydro.ac/): [Macesuted](https://hydro.ac/user/2)
+- [Kattis](https://open.kattis.com/): [macesuted](https://open.kattis.com/users/macesuted)
 - [LibreOJ](https://loj.ac/): [Macesuted](https://loj.ac/u/Macesuted)
 - [Luogu](https://www.luogu.com.cn/): [Macesuted](https://www.luogu.com.cn/user/98482)
 - (Private) NFLSOJ: Macesuted