func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e3 + 7;   struct node {     int x1, y1, x2, y2;     node() {}     node(int _x1, int _y1, int _x2, int _y2)         : x1(_x1), y1(_y1), x2(_x2), y2(_y2) {}   } q[N];   int n, m, r[N], r1[N], c[N], c1[N];   int main() {     scanf( %d , &n);     for (int i = 1; i <= n; i++) scanf( %d , &r[i]);     for (int i = 1; i <= n; i++) scanf( %d , &c[i]);     for (int i = 1; i <= n; i++) {       if (r[i] == i && c[i] == i) continue;       int x, y;       for (int j = i; j <= n; j++)         if (r[j] == i) r[j] = r[i], x = j;       for (int j = i; j <= n; j++)         if (c[j] == i) c[j] = c[i], y = j;       q[++m] = node(x, i, i, y);     }     printf( %d n , m);     for (int i = 1; i <= m; i++)       printf( %d %d %d %d n , q[i].x1, q[i].y1, q[i].x2, q[i].y2);   }   