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add some fun tree playing

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bt3gl 2023-07-29 14:28:17 -07:00 • committed by GitHub
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commit bb72bab679
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trees_and_graphs/has_path_sum.py Normal file
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def has_path_sum(root: Optional[TreeNode], target_sum: int) -> bool:
def transverse(node, sum_here=0):
if not node:
return sum_here == target_sum
sum_here += node.val
if not node.left:
return transverse(node.right, sum_here)
if not node.right:
return transverse(node.left, sum_here)
else:
return transverse(node.left, sum_here) or transverse(node.right, sum_here)
if not root:
return False
return transverse(root)