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Update 0257.二叉树的所有路径.md

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jianghongcheng
2023-05-22 17:14:09 -05:00
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parent 9b770de8cc
commit 1a672740e9
1 changed files with 9 additions and 9 deletions
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18
problems/0257.二叉树的所有路径.md
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@ -512,19 +512,19 @@ class Solution:
if not root:
return []
result = []
self.generate_paths(root, [], result)
self.traversal(root, [], result)
return result
def generate_paths(self, node: TreeNode, path: List[int], result: List[str]) -> None:
if not node:
def traversal(self, cur: TreeNode, path: List[int], result: List[str]) -> None:
if not cur:
return
path.append(node.val)
if not node.left and not node.right:
path.append(cur.val)
if not cur.left and not cur.right:
result.append('->'.join(map(str, path)))
else:
# path[:] 是隐藏回溯
self.generate_paths(node.left, path[:], result)
self.generate_paths(node.right, path[:], result)
if cur.left:
self.traversal(cur.left, path[:], result)
if cur.right:
self.traversal(cur.right, path[:], result)
```