private static int invitedFriends ( int length , char [ ] audience ) {
  int friends = 0 ;
  int totalStanding = 0 ;
  for ( int i = 0 ;
  i < length + 1 ;
  i ++ ) {
    totalStanding += Integer . parseInt ( "" + audience [ i ] ) ;
    if ( totalStanding < i + 1 ) {
      friends ++ ;
      totalStanding ++ ;
    }
  }
  return friends ;
}

private static int invitedFriends ( int length , char [ ] audience ) { int friends = 0 ; int totalStanding = 0 ; for ( int i = 0 ; i < length + 1 ; i ++ ) { totalStanding += Integer . parseInt ( " " + audience [ i ] ) ; if ( totalStanding < i + 1 ) { friends ++ ; totalStanding ++ ; } } return friends ; }
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