Merge pull request #516 from jojoo15/patch-40

添加 0042接雨水 python3版本 双指针法

problems/0042.接雨水.md

@@ -354,4 +354,24 @@ public:
 
 
 ## 其他语言版本 
-
+python 版本
+双指针法
+```python3
+class Solution:
+    def trap(self, height: List[int]) -> int:
+        res = 0
+        for i in range(len(height)):
+            if i == 0 or i == len(height)-1: continue
+            lHight = height[i-1]
+            rHight = height[i+1]
+            for j in range(i-1):
+                if height[j] > lHight:
+                    lHight = height[j]
+            for k in range(i+2,len(height)):
+                if height[k] > rHight:
+                    rHight = height[k]
+            res1 = min(lHight,rHight) - height[i]        
+            if res1 > 0:
+                res += res1
+        return res
+```