Set up environment

.gitignore

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+main*
+!main*.cpp

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug",
+            "type": "gdb",
+            "request": "launch",
+            "target": "${fileDirname}/${fileBasenameNoExtension}",
+            "cwd": "${workspaceRoot}",
+            "valuesFormatting": "prettyPrinters",
+            "preLaunchTask": "g++ build active file"
+        }
+    ]
+}

.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+      {
+        "type": "shell",
+        "label": "g++ build active file",
+        "command": "g++",
+        "args": ["-g", "${file}", "-o", "${fileDirname}/${fileBasenameNoExtension}"],
+        "group": {
+          "kind": "build",
+          "isDefault": true
+        }
+      }
+    ]
+}

main.cpp

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+#include <bits/stdc++.h>
+#define f first
+#define s second
+using namespace std;
+using ll = long long;
+using ii = pair<int, int>;
+constexpr int MX = 1e5+5;
+
+int main() {
+	if (fopen("in", "r")) freopen("in", "r", stdin), freopen("out", "w", stdout);
+	ios_base::sync_with_stdio(0), cin.tie(0);
+
+
+}

main2.cpp

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+#include <bits/stdc++.h>
+#define f first
+#define s second
+using namespace std;
+using ll = long long;
+using ii = pair<int, int>;
+constexpr int MX = 1e5+5;
+
+int main() {
+	if (fopen("in", "r")) freopen("in", "r", stdin), freopen("out", "w", stdout);
+	ios_base::sync_with_stdio(0), cin.tie(0);
+
+
+}

main3.cpp

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+#include <bits/stdc++.h>
+#define f first
+#define s second
+using namespace std;
+using ll = long long;
+using ii = pair<int, int>;
+constexpr int MX = 1e5+5;
+
+int main() {
+	if (fopen("in", "r")) freopen("in", "r", stdin), freopen("out", "w", stdout);
+	ios_base::sync_with_stdio(0), cin.tie(0);
+
+
+}