111、Minimum Depth of Binary Tree
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题目：
Given a binary tree, find its minimum depth.
The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.
解题思路：# Definition for a binary tree node.# class TreeNode(object):# def __init__(self, x):# self.val = x# self.left = None# self.right = Noneclass Solution(object): def minDepth(self, root): """ :type root: TreeNode :rtype: int """ def dfs(root,length): if(root==None):return length += 1 if(root.left==None and root.right==None): res.append(length) return dfs(root.left,length) dfs(root.right,length) res = [] dfs(root,0) if(res==[]):return 0 return min(res)
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