Package g0401_0500.s0407_trapping_rain_water_ii

Class Solution

java.lang.Object
g0401_0500.s0407_trapping_rain_water_ii.Solution
public class Solution extends java.lang.Object
407 - Trapping Rain Water II.

Hard

Given an m x n integer matrix heightMap representing the height of each unit cell in a 2D elevation map, return the volume of water it can trap after raining.

Example 1:

Input: heightMap = [[1,4,3,1,3,2],[3,2,1,3,2,4],[2,3,3,2,3,1]]

Output: 4

Explanation:

 After the rain, water is trapped between the blocks.
 We have two small ponds 1 and 3 units trapped.
 The total volume of water trapped is 4.

Example 2:

Input: heightMap = [[3,3,3,3,3],[3,2,2,2,3],[3,2,1,2,3],[3,2,2,2,3],[3,3,3,3,3]]

Output: 10

Constraints:

  • m == heightMap.length
  • n == heightMap[i].length
  • 1 <= m, n <= 200
  • 0 <= heightMap[i][j] <= 2 * 104

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    trapRainWater(int[][] heightMap)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • trapRainWater

      public int trapRainWater(int[][] heightMap)