Sorting

#include <bits/stdc++.h>
using namespace std;
#define cerr if(false) cerr
#define watch(x) cerr << (#x) << " is " << (x) << endl;
#define endl '\n'
#define ld long double
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define sz(a) (int)(a).size()
#define y1 lsdjkfhshfdsighoihweogihewoghi
#define all(x) (x).begin(), (x).end()


const int maxn = 105;

int a[maxn];
int ind[maxn];

void solve() {
    int n;    
    cin >> n;

    for(int i = 1; i <= n; i++) {
        cin >> a[i];
        ind[a[i]] = i;
    }

    for(int i = 1; i <= n-1; i++) {
        // swap ind[i] to i
        if(i == ind[i]) continue;
        if(i == ind[i]-1) {
            cout << "NO" << endl;
            return;
        }
        
        int tmp = ind[i];

        swap(a[i], a[tmp]);
        swap(a[i+1], a[tmp+1]);

        ind[a[i]] = i;
        ind[a[tmp]] = tmp;
        
        ind[a[i+1]] = i+1;
        ind[a[tmp+1]] = tmp+1;
    }

    for(int i = 1; i <= n; i++) {
        cerr << ind[i] << " ";
    }
    cerr << endl;

    cout << "YES" << endl;
}




signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int t;
    cin >> t;

    while(t--) solve();
}

/*

simulate

*/

// Did you read the bounds?
// Did you make typos?
// Are there edge cases (N=1?)
// Are array sizes proper?
// Integer overflow?
// DS reset properly between test cases?
// Is using long longs causing TLE?
// Are you using floating points?

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