From fe2362a97e0dd56ce76c8550c3d9007d53f779d3 Mon Sep 17 00:00:00 2001
From: baici1 <249337001@qq.com>
Date: Wed, 3 Nov 2021 10:37:08 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A042=E6=8E=A5=E9=9B=A8=E6=B0=B4?=
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---
 ...2.\346\216\245\351\233\250\346\260\264.md" | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git "a/problems/0042.\346\216\245\351\233\250\346\260\264.md" "b/problems/0042.\346\216\245\351\233\250\346\260\264.md"
index 9b26bc6b01..ca2c99333b 100644
--- "a/problems/0042.\346\216\245\351\233\250\346\260\264.md"
+++ "b/problems/0042.\346\216\245\351\233\250\346\260\264.md"
@@ -604,7 +604,48 @@ func trap(height []int) int {
 }
 ```
 
+动态规划解法：
+
+```go
+func trap(height []int) int {
+    sum:=0
+    n:=len(height)
+    lh:=make([]int,n)
+    rh:=make([]int,n)
+    lh[0]=height[0]
+    rh[n-1]=height[n-1]
+    for i:=1;i<n;i++{
+        lh[i]=max(lh[i-1],height[i])
+    }
+    for i:=n-2;i>=0;i--{
+        rh[i]=max(rh[i+1],height[i])
+    }
+    for i:=1;i<n-1;i++{
+        h:=min(rh[i],lh[i])-height[i]
+        if h>0{
+            sum+=h
+        }
+    }
+    return sum
+}
+func max(a,b int)int{
+    if a>b{
+        return a
+    }
+    return b
+}
+func min(a,b int)int{
+    if a<b{
+        return a
+    }
+    return b
+}
+```
+
+
+
 JavaScript:
+
 ```javascript
 //双指针
 var trap = function(height) {