func_code_string: #include <bits/stdc++.h>   int ex[] = {1, -1, 0, 0};   int wye[] = {0, 0, 1, -1};   using namespace std;   vector<int> vt[10005];   bool visit[10005];   int n, x, y, an;   void dfs(int node) {     if (visit[node]) return;     visit[node] = true;     int siz = vt[node].size();     int tmp;     for (int i = 0; i < siz; i++) {       tmp = vt[node][i];       if (visit[tmp]) continue;       dfs(tmp);     }   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     scanf( %d , &n);     for (int i = 1; i <= n; i++) {       scanf( %d , &x);       vt[i].push_back(x);       vt[x].push_back(i);     }     for (int i = 1; i <= n; i++) {       if (visit[i]) continue;       dfs(i);       an++;     }     printf( %d n , an);     return 0;   }   