comefrom: <gouthampradhan>two_pointers_TrappingRainWater_1.java
code: private int trap(int[] height) {
      if (height.length == 0) return 0;
      int[] left = new int[height.length];
      int[] right = new int[height.length];
      int max = 0;
      left[0] = 0;
      right[height.length - 1] = 0;
      int total = 0;
      for (int i = 1, l = height.length; i < l; i++) {
        left[i] = Math.max(max, height[i - 1]);
        max = left[i];
      }
      max = 0;
      for (int i = height.length - 2; i >= 0; i--) {
        right[i] = Math.max(max, height[i + 1]);
        max = right[i];
      }
      for (int i = 0, l = height.length; i < l; i++) {
        int min = Math.min(left[i], right[i]);
        if (min > height[i]) {
          total += (min - height[i]);
        }
      }
      return total;
    }
masked: private int sample_funcname ( int [ ] var_0 ) {
    if ( var_0 . length == 0 ) return 0 ;
    int [ ] var_3 = new int [ var_0 . length ] ;
    int [ ] var_4 = new int [ var_0 . length ] ;
    int max = 0 ;
    var_3 [ 0 ] = 0 ;
    var_4 [ var_0 . length - 1 ] = 0 ;
    int var_7 = 0 ;
    for ( int var_8 = 1 , var_9 = var_0 . length ;
    var_8 < var_9 ;
    var_8 ++ ) {
      var_3 [ var_8 ] = Math . max ( max , var_0 [ var_8 - 1 ] ) ;
      max = var_3 [ var_8 ] ;
    }
    max = 0 ;
    for ( int var_8 = var_0 . length - 2 ;
    var_8 >= 0 ;
    var_8 -- ) {
      var_4 [ var_8 ] = Math . max ( max , var_0 [ var_8 + 1 ] ) ;
      max = var_4 [ var_8 ] ;
    }
    for ( int var_8 = 0 , var_9 = var_0 . length ;
    var_8 < var_9 ;
    var_8 ++ ) {
      int min = Math . min ( var_3 [ var_8 ] , var_4 [ var_8 ] ) ;
      if ( min > var_0 [ var_8 ] ) {
        var_7 += ( min - var_0 [ var_8 ] ) ;
      }
    }
    return var_7 ;
  }
  