func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[1005], b[1005], c[1005], d[1005], posa[1005], posb[1005];   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     int n;     cin >> n;     for (int q = 1; q <= n; q++) {       int x;       cin >> x;       a[x] = q;     }     for (int q = 1; q <= n; q++) {       int x;       cin >> x;       b[x] = q;     }     for (int q = 1; q <= n; q++) {       c[q] = d[q] = posa[q] = posb[q] = q;     }     vector<array<int, 4>> v;     for (int q = 1; q <= n; q++) {       if (c[q] == a[q] && d[q] == b[q]) continue;       v.push_back({q, posb[b[q]], posa[a[q]], q});       posb[d[q]] = posb[b[q]];       posa[c[q]] = posa[a[q]];       d[posb[d[q]]] = d[q];       c[posa[c[q]]] = c[q];     }     cout << ((int)((v).size())) <<   n ;     for (int q = 0; q < ((int)((v).size())); q++) {       for (int w = 0; w < 4; w++) cout << v[q][w] <<    ;       cout <<   n ;     }     return 0;   }   