22 lines
644 B
Markdown
22 lines
644 B
Markdown
Given `n` non-negative integers representing an elevation map where the width of each bar is `1`, compute how much water it can trap after raining.
|
|
|
|
**Example 1:**
|
|
|
|
|
|
|
|
Input: height = [0,1,0,2,1,0,1,3,2,1,2,1]
|
|
Output: 6
|
|
Explanation: The above elevation map (black section) is represented by array [0,1,0,2,1,0,1,3,2,1,2,1]. In this case, 6 units of rain water (blue section) are being trapped.
|
|
|
|
|
|
**Example 2:**
|
|
|
|
Input: height = [4,2,0,3,2,5]
|
|
Output: 9
|
|
|
|
|
|
**Constraints:**
|
|
|
|
* `n == height.length`
|
|
* `1 <= n <= 2 * 104`
|
|
* `0 <= height[i] <= 105` |