public static void main ( String args [ ] ) {
  Scanner s = new Scanner ( System . in ) ;
  int t = s . nextInt ( ) ;
  while ( t -- != 0 ) {
    int n = s . nextInt ( ) ;
    long arr [ ] = new long [ n ] ;
    long sum = 0 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      arr [ i ] = s . nextLong ( ) ;
      sum += arr [ i ] ;
    }
    long curr = 0 , max = Long . MIN_VALUE ;
    int start = 0 , end = 0 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( curr + arr [ i ] <= arr [ i ] ) {
        start = i ;
      }
      else {
        end = i ;
      }
      curr = Math . max ( curr + arr [ i ] , arr [ i ] ) ;
      if ( curr >= max ) {
        if ( start == 0 && end == n - 1 ) {
          continue ;
        }
        max = Math . max ( max , curr ) ;
      }
    }
    String ans = "NO" ;
    if ( sum > max ) {
      ans = "YES" ;
    }
    System . out . println ( ans ) ;
  }
}

public static void main ( String args [ ] ) { Scanner s = new Scanner ( System . in ) ; int t = s . nextInt ( ) ; while ( t -- != 0 ) { int n = s . nextInt ( ) ; long arr [ ] = new long [ n ] ; long sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = s . nextLong ( ) ; sum += arr [ i ] ; } long curr = 0 , max = Long . MIN_VALUE ; int start = 0 , end = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( curr + arr [ i ] <= arr [ i ] ) { start = i ; } else { end = i ; } curr = Math . max ( curr + arr [ i ] , arr [ i ] ) ; if ( curr >= max ) { if ( start == 0 && end == n - 1 ) { continue ; } max = Math . max ( max , curr ) ; } } String ans = " NO " ; if ( sum > max ) { ans = " YES " ; } System . out . println ( ans ) ; } }
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