comefrom: <awangdev>Trapping Rain Water II_1.java
code: private boolean isValidCoordinate(int x, int y, boolean[][] visited) {
  
          int m = visited.length, n = visited[0].length;
          return x >= 0 && x < m && y >= 0 && y < n && !visited[x][y];
      }
masked: private boolean var_0 ( int var_1 , int var_2 , boolean [ ] [ ] var_4 ) {
    int var_6 = var_4 . length , var_8 = var_4 [ 0 ] . length ;
    return var_1 >= 0 && var_1 < var_6 && var_2 >= 0 && var_2 < var_8 && ! var_4 [ var_1 ] [ var_2 ] ;
  }
  