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1742B - Increasing.cpp
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1742B - Increasing.cpp
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/** ========================================**
** @Author: Kareem Taha Abdelfatah
** @Category: Codeforces problems solutions
** @brief: Problem Solving solutions
/** ========================================**/
#include<bits/stdc++.h>
#include<iterator>
using namespace std;
#define IO ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define endll "\n"
#define ll long long
#define LightOn(n, k) ((n) | (1<<k))
#define Lightoff(n, k) ((n) & (~(1<<k)))
#define IsOn(n, k) ((n>>k)&1)
const long long N = 1e6 + 5;
const long long MOD = 1e9 + 7, OO = 1e18;
const double PI = 3.14;
map<ll, ll>mp;
ll a[N], b[N];
set<ll>se;
vector<pair<ll, ll>>v;
int main()
{
IO
ll Tc; cin >> Tc;
while(Tc--){
mp.clear();
ll n, flag = 0; cin >> n;
for(ll i = 0; i < n; i++){
cin >> a[i];
mp[a[i]]++;
if(mp[a[i]] > 1) flag = 1;
}
if(flag == 1) cout << "NO" << endll;
else cout << "YES" << endll;
}
return 0;
}