Trapping Rain Water · Coding Interview Practice

Trapping Rain WaterGiven an array of bar heights, compute how much water can be trapped after raining.Constraints

1 <= height.length <= 2 * 10^4

0 <= height[i] <= 10^5

Examples

Input: height = [0,1,0,2,1,0,1,3,2,1,2,1] Output: 6

Input: height = [4,2,0,3,2,5] Output: 9

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