func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, a[5001], i, j, b[5001], ans;   int main() {     scanf( %d%d , &n, &m);     for (i = 1; i <= n; i++) {       scanf( %d , &a[i]);       b[i] = a[i];     }     for (i = 1; i <= n; i++)       if (a[i] == b[i])         for (j = 1; j <= n; j++)           if (a[i] != b[j] && b[i] != a[j]) swap(b[i], b[j]);     for (i = 1; i <= n; i++)       if (a[i] != b[i]) ans++;     printf( %d n , ans);     for (i = 1; i <= n; i++) printf( %d %d n , a[i], b[i]);   }   