chore: update cpp template

Author: omar-besbes

.vscode/cp.code-snippets

@@ -12,6 +12,8 @@
     "body": [
       "#include <bits/stdc++.h>",
       "using namespace std;",
+      "#define input \"input.in\"",
+      "#define output \"output.out\"",
       "",
       "void solve() {$0}",
       "",
@@ -20,6 +22,9 @@
       "   cin.tie(0);",
       "   cout.tie(0);",
       "",
+      "   if (fopen(input, \"r\")) freopen(input, \"r\", stdin);",
+      "   if (fopen(output, \"r\")) freopen(output, \"w+\", stdout);",
+      "",
       "   int t = 1;",
       "   cin >> t;",
       "   while (t--) solve();",

main.cpp

@@ -1,5 +1,7 @@
 #include <bits/stdc++.h>
 using namespace std;
+#define input "input.in"
+#define output "output.out"
 
 void solve() {}
 
@@ -8,6 +10,9 @@ int main() {
    cin.tie(0);
    cout.tie(0);
 
+   if (fopen(input, "r")) freopen(input, "r", stdin);
+   if (fopen(output, "r")) freopen(output, "w+", stdout);
+
    int t = 1;
    cin >> t;
    while (t--) solve();