func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<pair<int, int> > ed[200005];   int n, m, k;   unsigned long long Hash[200005];   unsigned long long H = 1e9 + 7;   unsigned long long a[10][10];   unsigned long long sum;   long long ans = 0;   void dfs(int kk1, unsigned long long s) {     if (kk1 == k) {       if (s == sum) {         ans += 1;       }       return;     }     for (int i = 0; i < kk1 + 1; i++) {       dfs(kk1 + 1, s + a[kk1 + 1][i]);     }   }   int main() {     cin.tie(0);     ios::sync_with_stdio(false);     cin >> n >> m >> k;     for (int i = 0; i < m; i++) {       int u, v, w;       cin >> u >> v >> w;       ed[u].push_back(make_pair(w, v));     }     for (int i = 1; i <= n; i++) {       sort(ed[i].begin(), ed[i].end());     }     Hash[1] = 1;     sum = 1;     for (int i = 2; i <= n; i++) {       Hash[i] = Hash[i - 1] * H;       sum += Hash[i];     }     for (int i = 1; i <= n; i++) {       int tp = ed[i].size();       for (int j = 0; j < tp; j++) {         int tpp = ed[i][j].second;         a[tp][j] += Hash[tpp];       }     }     dfs(1, a[1][0]);     cout << ans << endl;     return 0;   }   