好用

#include<iostream>
using namespace std;
int a[1000];
int main()
{
int T;cin>>T;
while(T--)
{
int flag = 1;
int n;cin>>n;
for(int i = 1;i<=n;i++)
cin>>a[i];
for(int i = 1;i<=n;i++)
{
for(int j = i + 1;j<=n;j++)
{
if(a[i] == a[j])
flag = 0;
}
}
if(flag == 1)
cout<<"YES"<<endl;
else
cout<<"NO"<<endl;
}
}