Sorting

#include <bits/stdc++.h>

using namespace std;

int main(void) {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int ntest;
    cin >> ntest;
    while (ntest--) {
        int n;
        cin >> n;
        vector<int> a(n);
        int ans = 0;
        for (int i = 0; i < n; ++i) {
            cin >> a[i];
            ans += abs(a[i] - (i + 1));
        }
        cout << (ans % 4 ? "NO" : "YES") << endl;
    }
    return 0;
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 2

Verdict: WRONG ANSWER

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 1, 2

Verdict: WRONG ANSWER