941.有效的山脉数组, 增加Python, Golang实现

problems/0941.有效的山脉数组.md

@@ -103,14 +103,52 @@ class Solution {
 }
 ```
 
-## Python
+## Python3
 
 ```python
+class Solution:
+    def validMountainArray(self, arr: List[int]) -> bool:
+        if len(arr) < 3 :
+            return False
+
+        i = 1
+        flagIncrease = False # 上升
+        flagDecrease = False # 下降
+
+        while i < len(arr) and arr[i-1] < arr[i]:
+            flagIncrease = True
+            i += 1
+
+        while i < len(arr) and arr[i-1] > arr[i]:
+            flagDecrease = True
+            i += 1
+
+        return i == len(arr) and flagIncrease and flagDecrease
+
 ```
 
 ## Go
 
 ```go
+func validMountainArray(arr []int) bool {
+	if len(arr) < 3 {
+		return false
+	}
+
+	i := 1
+	flagIncrease := false // 上升
+	flagDecrease := false // 下降
+
+	for ; i < len(arr) && arr[i-1] < arr[i]; i++ {
+		flagIncrease = true;
+	}
+
+	for ; i < len(arr) && arr[i-1] > arr[i]; i++ {
+		flagDecrease = true;
+	}
+
+	return i == len(arr) && flagIncrease && flagDecrease;
+}
 ```
 
 ## JavaScript