func_code_string: #include <bits/stdc++.h>   using namespace std;   std::vector<long long> v[100009];   long long vis[100009], c = 0;   void dfs(long long x) {     c++;     vis[x] = 1;     for (auto i : v[x])       if (!vis[i]) dfs(i);   }   signed main() {     ios_base::sync_with_stdio(false), cin.tie(NULL);     long long i, n, m, s = 0;     cin >> n >> m;     for (i = 1; i <= m; i++) {       long long a, b;       cin >> a >> b;       v[a].push_back(b);       v[b].push_back(a);     }     for (i = 1; i <= n; i++) {       if (!vis[i]) {         c = 0;         dfs(i);         s += (c - 1);       }     }     cout << m - s;   }   