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binary_tree_paths.py

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def binaryTreePaths(root):

res = []

if not root:

return res

DFS(res, root, str(root.val))

return res

def DFS(res, root, cur):

if not root.left and not root.right:

res.append(cur)

if root.left:

DFS(res, root.left, cur+'->'+str(root.left.val))

if root.right:

DFS(res, root.right, cur+'->'+str(root.right.val))