func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, q, cnt, f[400005];   int fnd(int x) { return f[x] == 0 ? x : f[x] = fnd(f[x]); }   int main() {     scanf( %d%d%d , &n, &m, &q);     cnt = n + m - 1;     for (int i = 1, x, y; i <= q; i++) {       scanf( %d%d , &x, &y);       y += n;       x = fnd(x);       y = fnd(y);       if (x != y) {         cnt--;         f[x] = y;       }     }     printf( %d n , cnt);     return 0;   }   