comefrom: <awangdev>39. Combination Sum_4.java
code: private boolean validate(int[] candidates, int target) {
  
          return candidates == null || candidates.length == 0 || target <= 0;
      }
masked: private boolean var_0 ( int [ ] var_1 , int var_2 ) {
    return var_1 == null || var_1 . length == 0 || var_2 <= 0 ;
  }
  