func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     {       ios_base::sync_with_stdio(false);       cin.tie(0);     };     int t;     cin >> t;     while (t--) {       int n, m;       cin >> n >> m;       vector<int> matching;       vector<int> vis(3 * n + 1, 0);       for (int i = 1; i <= m; i++) {         int u, v;         cin >> u >> v;         if (!vis[u] and !vis[v]) {           matching.push_back(i);           vis[u] = vis[v] = 1;         }       }       if (matching.size() >= n) {         cout <<  Matching  << endl;         for (int i = 0; i < n; i++) cout << matching[i] <<    ;         cout << endl;       } else {         cout <<  IndSet  << endl;         int seen = 0;         for (int i = 1; i <= 3 * n and seen < n; i++) {           if (!vis[i]) {             cout << i <<    ;             seen++;           }         }         cout << endl;       }     }   }   