comefrom: <awangdev>305. Number of Islands II_2.java
code: private boolean validateInput(int m, int n, int[][] positions) {
  
          return m <= 0 || n <= 0 || positions == null || positions.length == 0 || positions[0] == null || positions[0].length == 0;
      }
masked: private boolean var_0 ( int var_1 , int var_2 , int [ ] [ ] var_3 ) {
    return var_1 <= 0 || var_2 <= 0 || var_3 == null || var_3 . length == 0 || var_3 [ 0 ] == null || var_3 [ 0 ] . length == 0 ;
  }
  