func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int k;   bool debug = false;   int f[100005];   int ff(int x) {     while (x != f[x]) x = f[x];     return x;   }   int main() {     scanf( %d%d , &n, &m);     for (int i = 1; i <= n; i++) f[i] = i;     int a, b;     long long ans = 1;     for (int i = 0; i < m; i++) {       scanf( %d%d , &a, &b);       int fa = ff(a), fb = ff(b);       if (fa == fb) {         ans = ans * 2 % 1000000009;       } else {         f[fa] = fb;       }       printf( %I64d n , ans - 1);     }     return 0;   }   