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: Given binary tree [3,9,20,null,null,15,7…
/** * Definition for a binary tree node. * public class TreeNode { * public int val; * public TreeNode left; * public TreeNode right; * public TreeNode(int x) { val = x; } * } */ public class Solution { Stack<TreeNode> S = new Stack<TreeNode>(…
题目描述 给出一组候选数C和一个目标数T,找出候选数中加起来和等于T的所有组合. C中的数字在组合中可以被无限次使用 注意: 题目中所有的数字(包括目标数T)都是正整数 你给出的组合中的数字 (a 1, a 2, - , a k) 要按非递增排序 (ie, a 1 ≤ a 2 ≤ - ≤ a k). 结解集中不能包含重复的组合 例如:给定的候选数集是[2,3,6,7],目标数是7 解集是: [7] [2, 2, 3] Given a set of candidate numbers ( C …
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. 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 maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7]…
