func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 1e5 + 5;   const long long MOD = 1e9 + 7;   long long n, m, connected = 0;   long long col[N], vis[N];   vector<pair<long long, long long> > g[N];   long long pow(long long a, long long b, long long m) {     long long ans = 1;     while (b) {       if (b & 1) ans = (ans * a) % m;       b /= 2;       a = (a * a) % m;     }     return ans;   }   void dfs(long long k, long long c) {     if (vis[k]) {       if (col[k] != c) {         cout <<  0 ;         exit(0);       }       return;     }     vis[k] = 1;     col[k] = c;     for (auto &it : g[k]) {       dfs(it.first, c ^ (1 - it.second));     }   }   int32_t main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     cin >> n >> m;     for (long long i = 1; i <= m; i++) {       long long u, v, t;       cin >> u >> v >> t;       g[u].push_back({v, t});       g[v].push_back({u, t});     }     for (long long i = 1; i <= n; i++) {       if (!vis[i]) {         dfs(i, 0);         connected++;       }     }     long long ans = pow(2LL, connected - 1, MOD);     cout << ans;     return 0;   }   