cf-B - Valerii Against Everyone - code.cpp

#include<bits/stdc++.h>
using namespace std;
typedef long long ll; 
#define pb push_back
#define io ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); 
#define all(s) s.begin(),s.end()
#define rep(i, a, b) for(ll i = a; i < b; i++)
#define rr(v) for(auto &val:v)
#define _max(v) *max_element(v.begin(), v.end())
#define _min(v) *min_element(v.begin(), v.end())
#define ms(s, n) memset(s, n, sizeof(s))
ll raised(ll x,  ll y){ll res = 1;while (y > 0){ if (y & 1){res = res*x;} y = y>>1;x = x*x;}return res;}
ll raisedmod(ll x, ll y, ll p){int res = 1;x = x % p;while (y > 0){if (y & 1){res = (res*x) % p;}y = y>>1; x = (x*x) % p;}return res;}
ll gcd(ll a, ll b) { if (b == 0)return a; return gcd(b, a % b);} 
ll fact(ll n){ll res = 1; for (ll i = 2; i <= n; i++) res = res * i; return res; } 
ll nCr(ll n, ll r){ return fact(n) / (fact(r) * fact(n - r));} 
#define mod 1e9+7

int main() 
{
    io;
    ll t; cin >> t;
    //t=1;
    while(t--)
    {
    ll n, x;
     map<ll,ll> mp;
     cin >>n;
     
     rep(i, 0, n)
     {
         cin >> x;
         mp[x]++;
     }
     
     ll f=0;
     for(auto &it: mp)
     {
         if(it.second>=2) {f=1; break;}
     }
     
     if(f==1) cout<< "YES\n";
     else cout<< "NO\n";
     
    }
	return 0;
}