Update 0257.二叉树的所有路径.md

problems/0257.二叉树的所有路径.md

@@ -470,7 +470,7 @@ class Solution {
 ## Python:  
 	
 	
-递归法+回溯（版本一）
+递归法+回溯
 ```Python
 # Definition for a binary tree node.
 class Solution:
@@ -561,16 +561,11 @@ class Solution:
 迭代法：
 
 ```Python
-from collections import deque
-
-
 class Solution:
-    """二叉树的所有路径 迭代法"""
 
     def binaryTreePaths(self, root: TreeNode) -> List[str]:
         # 题目中节点数至少为1
-        stack, path_st, result = deque([root]), deque(), []
-        path_st.append(str(root.val))
+        stack, path_st, result = [root], [str(root.val)], []
 
         while stack:
             cur = stack.pop()