Minimum Depth of Binary Tree, Leetcode 解题笔记

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.

/**
 * Definition for binary tree
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {
    
    public int minDepth(TreeNode root) {
        if(root == null) return 0;
        if(root.left == null) return minDepth(root.right)+1;
        if(root.right == null) return minDepth(root.left)+1;
        return Math.min(minDepth(root.left), minDepth(root.right)) + 1;
    }
   
}
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