一天一道LeetCode#104. Maximum Depth of Binary Tree

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(一)题目

来源:https://leetcode.com/problems/maximum-depth-of-binary-tree/

Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

(二)解题

题目大意:求二叉树的最大深度
解题思路:采用深度优先搜索,很容易求出最大深度

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    int max;//用来保存最大深度值
    int maxDepth(TreeNode* root) {
        max = 0;
        dfsTree(root,0);//深度优先搜索递归
        return max;
    }
    void dfsTree(TreeNode* root , int dep)
    {
        if(dep>max) max=dep;//记录最大深度值
        if(root==NULL) return;
        dfsTree(root->left,dep+1);//遍历左子树
        dfsTree(root->right,dep+1);//遍历右子树
    }
};

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