Package g0401_0500.s0407_trapping_rain_water_ii

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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

    • <code>0 <= heightMapj<= 2 * 10<sup>4</sup></code>

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer trapRainWater(Array<IntArray> heightMap)

      • Methods inherited from class java.lang.Object

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