func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int visited[100001];   vector<long long int> adj[100001];   long long int sum = 0;   void dfs(long long int s) {     if (visited[s] == 1) {       return;     }     sum++;     visited[s] = 1;     for (auto u : adj[s]) {       dfs(u);     }   }   long long int binpow(long long int x, long long int n) {     if (n == 0) return 1;     long long u = binpow(x, n / 2);     u = (u * u);     if (n % 2 == 1) u = (u * x);     return u;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long int n, m;     cin >> n >> m;     while (m--) {       long long int x, y;       cin >> x >> y;       adj[x].push_back(y);       adj[y].push_back(x);     }     memset(visited, 0, sizeof(visited));     ;     long long int ans = 1;     for (long long int i = 1; i <= n; i++) {       if (visited[i] == 0) {         sum = 0;         dfs(i);         long long int y = sum - 1;         long long int r = binpow(2, y);         ans = ans * r;       }     }     cout << ans << endl;     return 0;   }   