263. Ugly Number-丑数
Write a program to check whether a given number is an u... » 阅读全文
258. Add Digits-各位相加
给定一个非负整数num，反复将各个位上的数字相加，直到结果为一位数。返回这个结果。 示例 1: 输入: num... » 阅读全文
257. Binary Tree Paths-二叉树的所有路径
Given a binary tree, return all root-to-leaf paths. Not... » 阅读全文
235. Lowest Common Ancestor of a Binary Search Tree-二叉搜索树的最近公共祖先
Given a binary search tree (BST), find the lowest commo... » 阅读全文
234. Palindrome Linked List-回文链表
Given a singly linked list, determine if it is a palind... » 阅读全文
232. Implement Queue using Stacks-用栈实现队列
Implement a first in first out (FIFO) queue using only ... » 阅读全文
231. Power of Two-2的幂
Given an integer n, return true if it is a power of two... » 阅读全文
228. Summary Ranges-汇总区间
You are given a sorted unique integer array nums. Retur... » 阅读全文
226. Invert Binary Tree-翻转二叉树
Invert a binary tree. Example: Input: Output: Solution ... » 阅读全文
225. Implement Stack using Queues-用队列实现栈
Implement a last in first out (LIFO) stack using only t... » 阅读全文