添加新题目

双指针/接雨水/main.go

@@ -1,33 +1,73 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+)
 
 func main() {
-	resule := trap([]int{4, 2, 0, 3, 2, 5})
+	resule := trap([]int{0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1})
 	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
-		}
+	value := 0
+	leftmax := make([]int, len(height))
+	rightmax := make([]int, len(height))
+	leftmax[0] = height[0]
+	rightmax[len(height)-1] = height[len(height)-1]
+	for i := 1; i < len(height); i++ {
+		leftmax[i] = max(leftmax[i-1], height[i])
 	}
-	return result
+	for j := len(height) - 2; j >= 0; j-- {
+		rightmax[j] = max(rightmax[j+1], height[j])
+	}
+	fmt.Println(leftmax)
+	fmt.Println(rightmax)
+	for i := 0; i < len(height); i++ {
+		value += min(leftmax[i], rightmax[i]) - height[i]
+	}
+
+	return value
 }
+
+// 错误思路:只计算凹槽，一个桶里可能有多个凹槽
+//
+//func trap(height []int) int {
+//	tap := make([]int, 0)
+//	for i := 0; i < len(height); i++ {
+//		if i-1 >= 0 && i+1 < len(height) {
+//			if height[i-1]-height[i] > 0 && height[i] < height[i+1] {
+//				tap = append(tap, i)
+//			}
+//		}
+//	}
+//	fmt.Println(tap)
+//	value := 0
+//	for i := range tap {
+//		tempvalue := 0
+//		left, right := tap[i], tap[i]
+//		for height[left-1] > height[left] {
+//			left--
+//		}
+//		for height[right+1] > height[right] {
+//			right++
+//		}
+//		fmt.Println("左右指针指向：", left, right)
+//		temp := min(height[left], height[right])
+//		for left != right {
+//			if temp-height[left] < 0 {
+//				left++
+//			} else {
+//				value += temp - height[left]
+//				tempvalue += temp - height[left]
+//				fmt.Println("当前temp和left的值", temp, height[left])
+//				fmt.Println("添加体积：", tempvalue)
+//
+//				left++
+//			}
+//
+//		}
+//		fmt.Println("临时体积：", tempvalue)
+//	}
+//	return value
+//}