算法：求树的最大深度104. Maximum Depth of Binary Tree
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题目
104. Maximum Depth of Binary Tree
Given the root of a binary tree, return its maximum depth.
A binary tree’s maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.
Example 1:
Input: root = [3,9,20,null,null,15,7]
Output: 3
Example 2:
Input: root = [1,null,2]
Output: 2
Example 3:
Input: root = []
Output: 0
Example 4:
Input: root = [0]
Output: 1
Constraints:
The number of nodes in the tree is in the range [0, 104].
-100 <= Node.val <= 100
深度优先算法
/*** Definition for a binary tree node.* public class TreeNode {* int val;* TreeNode left;* TreeNode right;* TreeNode() {}* TreeNode(int val) { this.val = val; }* TreeNode(int val, TreeNode left, TreeNode right) {* this.val = val;* this.left = left;* this.right = right;* }* }*/
class Solution {public int maxDepth(TreeNode root) {// check edgeif (root == null) {return 0;}return 1 + Math.max(maxDepth(root.left), maxDepth(root.right));}
}
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