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leetcode--Maximum Depth of Binary Tree

2024-07-07 03:40:39   222人阅读

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.

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/**
 * Definition for binary tree
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {
    /**This is a fundamental problem on recursive method.<br>
     * @param root --the root node of a tree
     * @return max depth
     * @author Averill Zheng
     * @version 2014-06-03
     * @since JDK 1.7
     */
    public int maxDepth(TreeNode root) {
        int maxDepth = 0;
        if(root != null){
            if(root.left == null)
                maxDepth = 1 + maxDepth(root.right);
            else if(root.right == null)
                maxDepth = 1 + maxDepth(root.left);
            else
                maxDepth = 1 + Math.max(maxDepth(root.left), maxDepth(root.right));
        }
        return maxDepth;   
    }
}

　　


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