#include <cstdio>
#include <algorithm>

using namespace std;

int readint(){
    int ch=getchar(),ret=0;
    while(ch<'0' || ch>'9') ch=getchar();
    while(ch>='0' && ch<='9') ret=ret*10+ch-'0',ch=getchar();
    return ret;
}
long long a[100009],cur;
int T,n;
int main(){
#ifdef YJQ_LOCAL
    freopen(".in","r",stdin);
#endif
    scanf("%d",&T);
    while(T--){
        n=readint();
        bool flag=false,flag0=false;
        for (int i=1;i<=n;i++){
            a[i]=readint();
            if (a[i]==1){
                flag=true;
            }
            if (a[i]==0) 
                flag0=true;
        }
        if (flag && flag0){
            printf("YES\n");
        }
        else printf("NO\n");
    }
}