47. Permutations II

3. Longest Substring Without Repeating Characters

121. Best Time to Buy and Sell Stock

2. Add Two Numbers

100. Same Tree

226. Invert Binary Tree

338. Counting Bits

110. Balanced Binary Tree

104. Maximum Depth of Binary Tree

1. Two Sum

7. Reverse Integer

35. Search Insert Position

46. Permutations

9. Palindrome Number

28. Implement strStr()

326. Power of Three

342. Power of Four

145. Binary Tree Postorder Traversal

144. Binary Tree Preorder Traversal

127. Word Ladder

14.二分查找

198. House Robber

232. Implement Queue using Stacks

217. Contains Duplicate

171. Excel Sheet Column Number

Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = “anagram”, t = “nagaram”, return true. s = “rat”, t = “car”, return false.Note: You may assume

202. Happy Number

70. Climbing Stairs

Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it in

237. Delete Node in a Linked List

83. Remove Duplicates from Sorted List

328. Odd Even Linked List

169. Majority Element

326. Power of Three

191. Number of 1 Bits

21. Merge Two Sorted Lists

Move Zeroes

258. Add Digits

Nim Game

13. Roman to Integer