Python | Leetcode Python题解之第437题路径总和III
题目：
题解：
class Solution:
def pathSum(self, root: TreeNode, targetSum: int) -> int:
prefix = collections.defaultdict(int)
prefix[0] = 1
def dfs(root, curr):
if not root:
return 0
ret = 0
curr += root.val
ret += prefix[curr - targetSum]
prefix[curr] += 1
ret += dfs(root.left, curr)
ret += dfs(root.right, curr)
prefix[curr] -= 1
return ret
return dfs(root, 0)原文地址：https://blog.csdn.net/Mopes__/article/details/142537139
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