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Pit Volume Finder

Hard

Two Pointers

In "Pit Volume Finder", each number is the height of a wall with width 1.

Compute how many total units of rainwater are trapped after rainfall.

Example 1

Input:height = [0,4,1,3,0,1,2]
Output:5

For input height = [0,4,1,3,0,1,2], summing trapped water over each position gives 5. Therefore, return 5.

Example 2

Input:height = [4,1,0,2,3,0,2]
Output:8

For input height = [4,1,0,2,3,0,2], summing trapped water over each position gives 8. Therefore, return 8.

Constraints

  • 1 <= height.length <= 2 * 104
  • 0 <= height[i] <= 105
solution.js
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Test Cases (2)

Test Case 1
Input:
[0,4,1,3,0,1,2]
Expected Output:
5
Test Case 2
Input:
[4,1,0,2,3,0,2]
Expected Output:
8