Pair sort

#include <bits/stdc++.h>

using namespace std;
#define int long long

// g++ <filename>.cpp -g -Wall -Wextra -DDEBUG -o <executable>

// copied from: https://codeforces.com/blog/entry/79024
// === Debug macro starts here ===

int recur_depth = 0;
#ifdef DEBUG
#define dbg(x) {++recur_depth; auto x_=x; --recur_depth; cerr<<string(recur_depth, '\t')<<"\e[91m"<<__func__<<":"<<__LINE__<<"\t"<<#x<<" = "<<x_<<"\e[39m"<<endl;}
#else
#define dbg(x)
#endif
template<typename Ostream, typename Cont>
typename enable_if<is_same<Ostream,ostream>::value, Ostream&>::type operator<<(Ostream& os,  const Cont& v){
	os<<"[";
	for(auto& x:v){os<<x<<", ";}
	return os<<"]";
}
template<typename Ostream, typename ...Ts>
Ostream& operator<<(Ostream& os,  const pair<Ts...>& p){
	return os<<"{"<<p.first<<", "<<p.second<<"}";
}

// === Debug macro ends here ===

signed main() {
    
    int n;
    cin >> n;

    vector<int> numbers;

    for (int i = 0; i < 2*n; i++) {
        int a;
        cin >> a;
        numbers.push_back(a);
    }

    int swaps = 0;
    vector<vector<int>> swap_list; 

    for (int i = 1; i < 2*n; i++) {

        // cout << "i: " << i << "\n";
        int n = numbers[i];

        int pair = numbers[i-1];

        // cout << n << " : " << pair << "\n";

        if (n != pair) {
            // look for pair number
            for (int j = i+1; j < 2*n; j++) {
                
                if (pair == numbers[j]) {
                    int temp = numbers[i];
                    numbers[i] = numbers[j];
                    numbers[j] = temp;

                    // cout << "swapped " << n-1 << " and " << j << "\n";
                    vector<int> swaps = {i+1, j+1};
                    swap_list.push_back(swaps);
                }
            }
            swaps++;
        }
        i++;
    }

    cout << swaps << "\n";
    
    for (auto s : swap_list) {
        cout << s[0] << " " << s[1] << "\n";
    }

    dbg(numbers);
    
    

    return 0;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER