func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n;     cin >> n;     vector<long long> h(n + 5);     vector<long long> deg(n + 5, 0), a(n + 5, 0);     for (long long i = 1; i <= n; i++) cin >> h[i];     for (long long i = 1; i <= n; i++) cin >> a[i], deg[a[i]]++;     long long c = -1;     long long maxi = 0;     for (long long i = 1; i <= n; i++) {       if (h[i] == 1) {         long long x = a[i];         long long cnt = 1;         while (x > 0 && deg[x] == 1) cnt++, x = a[x];         if (cnt > maxi) {           maxi = cnt;           c = i;         }       }     }     vector<long long> temp;     temp.push_back(c);     c = a[c];     while (c > 0 && deg[c] == 1) temp.push_back(c), c = a[c];     long long l = (long long)temp.size();     cout << l <<   n ;     for (long long i = l - 1; i >= 0; i--) cout << temp[i] <<    ;   }   