添加接雨水Java+Python代码

高频面试系列/接雨水.md

@@ -184,6 +184,66 @@ if (l_max < r_max) {
 ![labuladong](../pictures/labuladong.jpg)
 
 
+[eric wang](https://www.github.com/eric496) 提供 Java 代码
+
+```java
+public int trap(int[] height) {
+    if (height.length == 0) {
+        return 0;
+    }
+
+    int n = height.length;
+    int left = 0, right = n - 1;
+    int ans = 0;
+
+    int l_max = height[0];
+    int r_max = height[n - 1];
+
+    while (left <= right) {
+        l_max = Math.max(l_max, height[left]);
+        r_max = Math.max(r_max, height[right]);
+
+        if (l_max < r_max) {
+            ans += l_max - height[left];
+            left++;
+        } else {
+            ans += r_max - height[right];
+            right--;
+        }
+    }
+
+    return ans;
+}
+```
+
+[eric wang](https://www.github.com/eric496) 提供 Python3 代码
+
+```python
+def trap(self, height: List[int]) -> int:
+    if not height:
+        return 0
+
+    n = len(height)
+    left, right = 0, n - 1
+    ans = 0
+
+    l_max = height[0]
+    r_max = height[n - 1]
+
+    while left <= right:
+        l_max = max(l_max, height[left])
+        r_max = max(r_max, height[right])
+
+        if l_max < r_max:
+            ans += l_max - height[left]
+            left += 1
+        else:
+            ans += r_max - height[right]
+            right -= 1
+
+    return ans
+```
+
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