# LeetCode第42题:Trapping Rain Water总结

## 题目

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.

• 大意： 有n个非负整数，代表地势图的高度，如图，计算下雨后这个地形能存多少雨水。