最小深度是指树的根结点到最近叶子结点的最短路径上结点的数量。 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. 示例1: 输入: (1
1.左右子树都不为空时,为子树中较小的minimum depth+1; 2.有一个子树为空时,为非空子树的minimum depth+1; 3.都为空时,为1。 这样就可以解决了,时间复杂度为O(n),代码如下: 1intminDepth(TreeNode *root) {2if(root==NULL)return0;3if(root->left==NULL&&root->right==NULL)4return1;56intrm...
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. 输入描述: 输出描述: 示例1: 输入: 输出: 代码: import java.util.LinkedList; import java.util.Queue; public class Solution { publi...
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. Note:A leaf is a node with no children. Example: Given binary tree[3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 ...
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. 本题思路: 1. 每进入一层用一个变量(这里是levelNum)记录当前从根节点到这一层节点的节点数 ...
LeetCode 111 题,Minimum Depth of Binary Tree 解题思路 1、读题,求解二叉树的最小Depth。 2、用bfs 去解决,队列带上每层的层数。当有一个节点的左右子树都为空时,返回当前层数,就找到解。 Python 代码 # De…
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. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7], ...
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. Note: A leaf is a node with no children. Example 1: Input: root = [3,9,20,null,null,15,7] Output: 2 Example 2: ...
www.lintcode.com/en/problem/minimum-depth-of-binary-tree/ 【题目解析】不妨设minDepth(t)表示“以t为根节点的子树中,所有叶子节点中深度最小的一个节点的深度”,那么我们想要求的答案就是minDepth(root)。那么如何求解minDepth(t)呢?我们不妨分情况进行讨论:如果t是叶子节点,即不存在左儿子和右儿子,那么...
Minimum Depth of Binary Tree 问题: 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. 大意: 给出一个二叉树,找到他最小的深度。 最小的深度是指从根节点到叶子......