func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, c;   long long a[3001];   pair<int, int> sol[3001];   int main() {     ios_base::sync_with_stdio(0);     cin >> n;     for (int i = 0; i < n; ++i) cin >> a[i];     c = 0;     for (int i = 0; i < n; ++i) {       int mn = i;       for (int j = i + 1; j < n; ++j) {         if (a[mn] > a[j]) {           mn = j;         }       }       if (a[mn] < a[i]) {         swap(a[i], a[mn]);         sol[c] = pair<int, int>(i, mn);         ++c;       }     }     cout << c << endl;     for (int i = 0; i < c; ++i) {       cout << sol[i].first <<     << sol[i].second << endl;     }     return 0;   }   