Problem: Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
For example,
Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6.
Solution:
For example,
Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6.
Solution:
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