Java [Leetcode 111]Minimum Depth of Binary Tree
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题目描述:
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:
递归。
代码描述:
/** * Definition for a binary tree node. * 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 1 + minDepth(root.right); if(root.right == null) return 1 + minDepth(root.left); return Math.min(1 + minDepth(root.left), 1 + minDepth(root.right)); } }
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