package main

import "fmt"

func main() {
	resule := trap([]int{4, 2, 0, 3, 2, 5})
	fmt.Println("最大接水数为：", resule)
}

func trap(height []int) int {
	leftP := 0
	rightP := 1
	result := 0
	midres := 0
	for {
		if leftP > len(height)-1 || rightP > len(height)-1 {
			break
		}
		if height[leftP] > height[rightP] {
			midres += height[leftP] - height[rightP]
			fmt.Println("result加上:", height[leftP]-height[rightP], "当前左指针：", leftP, "当前右指针:", rightP)
			rightP++
		} else if height[leftP] <= height[rightP] && midres != 0 {
			result += midres
			leftP = rightP
			rightP = leftP + 1
		} else {
			leftP++
			rightP = leftP + 1
		}
	}
	return result
}