【LeetCode111-20.8.21-二叉树的最小深度】链接:LeetCode111
过程:略
思路:dfs,看题解觉得bfs较好
代码:
/**
* Definition for a binary tree node.
* public class TreeNode {
*int val;
*TreeNode left;
*TreeNode right;
*TreeNode(int x) { val = x;
}
* }
*/
class Solution {
public int minDepth(TreeNode root) {
if(root==null)return 0;
if(root.left==null&&root.right==null)return 1;
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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