B - Increasing.cpp

#include <bits/stdc++.h>

using namespace std;

int t, n, a[105];

int main(){
    cin.tie(nullptr), ios::sync_with_stdio(false);
    cin >> t;
    while(t--){
        cin >> n;
        for(int i = 0; i< n; i++) cin >> a[i];
        sort(a, a + n);
        bool ans = true;
        for(int i = 1; i < n; i++){
            if(a[i - 1] == a[i]) ans = false;
        }
        cout << (ans ? "YES\n" : "NO\n");
    }
}