Chef vs Doof Problem Code: CLLCM Codechef Solution

 #include <iostream>
using namespace std;
int main(){
  ios::sync_with_stdio(0);
  cin.tie(NULL);
  int t;
  cin>>t;
  while(t--){
    int n,flag=0;
    cin>>n;
    while(n--){
      int tmp;
      cin>>tmp;
      flag|=!(tmp&1);
    }
    if(flag)
      cout<<"NO";
    else cout<<"YES";
    cout<<'\n';
  }
  return 0;
}