Note

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My Leetcode Solutions

bold num means I DO NOT come up a solution by myself...

#	Title	Solution	Difficulty
1	Two Sum	Swift	Easy
2	Add Two Numbers	Swift	Medium
14	Longest Common Prefix	Java	Easy
15	3Sum	Swift, Python, Python	Medium
19	Remove Nth Node From End of List	Java, Swift	Medium
20	Valid Parentheses	Swift	Easy
21	Merge Two Sorted Lists	Swift	Easy
22	Generate Parentheses	Swift, Python	Medium
23	Merge k Sorted Lists	Python2	Hard
24	Swap Nodes in Pairs	Swift	Medium
25	Reverse Nodes in k-Group	Swift	Hard
27	Remove Element	Swift	Easy
28	Implement strStr()	Swift	Easy
33	Search in Rotated Sorted Array	Swift	Medium
36	Valid Sudoku	Swift	Medium
37	Sudoku Solver	Swift	Hard
50	Pow(x,n)	Swift, Python	Medium
51	N-Queens	Swift,Swift, Python	Hard
52	N-Queens II	Swift	Hard
54	Spiral Matrix	Swift	Medium
59	Spiral Matrix II	Swift	Medium
61	Rotate List	Java	Medium
66	Plus One	Swift	Easy
67	Add Binary	Swift	Easy
69	Sqrt(x)	Swift, Swift	Easy
70	Climbing Stairs	Swift, Swift	Easy
72	Edit Distance	Swift	Hard
79	Word Search	Swift	Medium
81	Search in Rotated Sorted Array II	Swift	Medium
82	Remove Duplicates from Sorted List II	Swift	Medium
98	Validate Binary Search Tree	Swift, Python	Medium
100	Same Tree	Swift	Easy
102	Binary Tree Level Order Traversal	Swift, Python, Python	Medium
104	Maximum Depth of Binary Tree	Swift	Easy
105	Construct Binary Tree from Preorder and Inorder Traversal	Swift	Medium
111	Minimum Depth of Binary Tree	Swift	Easy
118	Pascal's Triangle	Swift	Easy
119	Pascal's Triangle II	Swift	Easy
120	Triangle	Swift	Medium
121	Best Time to Buy and Sell Stock	Swift	Easy
122	Best Time to Buy and Sell Stock II	Swift, Swift	Easy
123	Best Time to Buy and Sell Stock III	Swift, Swift, Python	Hard
138	Copy List with Random Pointer	Java	Medium
141	Linked List Cycle	Java, Swift	Easy
142	Linked List Cycle II	Java, Swift	Medium
146	LRU Cache	Swift	Medium
148	Sort List	Swift	Medium
152	Maximum Product Subarray	Swift, Swift, Python, Python	Medium
153	Find Minimum in Rotated Sorted Array	Swift	Medium
160	Intersection of Two Linked Lists	Java	Easy
167	Two Sum II - input array is sorted	Swift	Easy
169	Majority Element	Swift	Easy
189	Rotate Array	Swift	Easy
191	Number of 1 Bits	Java, Swift	Easy
200	Number of Islands	Swift	Medium
203	Remove Linked List Element	Java	Easy
206	Reverse Linked List	Java, Swift, Swift	Easy
208	Implement Trie (Prefix Tree)	Swift	Medium
212	Word Search II	Swift	Hard
215	Kth Largest Element in an Array	Swift	Medium
224	Basic Calculator	Swift	Hard
225	Implement Stack using Queue	Swift	Easy
230	Kth Smallest Element in a BST	Swift	Medium
231	Power of Two	Swift	Easy
232	Implement Queue using Stacks	Swift	Easy
234	Palindrome Linked List	Java	Easy
235	Lowest Common Ancestor of a Binary Search Tree	Swift, Java	Easy
236	Lowest Common Ancestor of a Binary Tree	Swift, Java	Medium
238	Product of Array Except Self	Swift	Medium
239	Sliding Window Maximum	Swift, Swift,Swift	Hard
242	Valid Anagram	Swift, Swift,	Easy
283	Move Zeroes	Swift	Easy
295	Find Median from Data Stream	Swift	Hard
300	Longest Increasing Subsequence	Swift, Swift	Medium
322	Coin Change	Swift	Medium
328	Odd Even Linked List	Java	Medium
338	Counting Bits	Swift	Medium
344	Reverse String	Swift	Easy
367	Valid Perfect Square	Swift	Easy
373	Find K Pairs with Smallest Sums	Swift	Medium
402	Remove K Digits	Swift	Medium
430	Flatten a Multilevel Doubly Linked List	Java	Medium
450	Delete Node in a BST	Swift	Medium
451	Sort Characters By Frequency	Swift	Medium
456	132 Pattern	Swift	Medium
498	Diagonal Traverse	Swift	Medium
547	Friend Circles	Swift	Medium
561	Array Partition I	Swift	Easy
621	Task Scheduler	Swift	Medium
622	Design Circular Queue	Swift	Medium
697	Degree of an Array	Swift	Easy
700	Search in a Binary Search Tree	Swift	Easy
701	Insert into a Binary Search Tree	Swift	Medium
703	Kth Largest Element in a Stream	Swift	Easy
707	Design Linked List	Java	Easy
708	Insert into a Cyclic Sorted List	Java	Medium
724	Find Pivot Index	Swift	Easy
747	Largest Number At Least Twice of Others	Swift	Easy
785	Is Graph Bipartite?	Swift	Medium
849	Maximize Distance to Closest Person	Swift	Easy
871	Minimum Number of Refueling Stops	Swift	Hard
938	Range Sum of BST	Swift	Easy
946	Validate Stack Sequences	Swift	Medium
997	Find the Town Judge	Swift	Easy

Algorithms

Other Swift Algorithms Repo

• swift-algorithm-club: Algorithms and data structures in Swift, with explanations!
• SwiftGraph
• Swift Algorithms Classroom
• Swift Sorts
• Swift Data Structures and Algorithms
• BTree: Fast ordered collections for Swift using in-memory B-trees
• JXSort
• stanfordacm: Stanford ACM-ICPC related materials
• Google Interview University
• Top 20 dynamic programming interview questions

Leetcode

• Leetcode
• LeetCode-Swift: Solutions to LeetCode by Swift
• 左耳朵耗子的leetcode
• leetcode: LeetCode题解，151道题完整版
• Grandyang: leetcode题目解析
• LeetCode-Solutions: Solutions for LeetCode Problems
• LeetCode-Go

Blogs

• Know Thy Complexities!

• Computing optimal road trips on a limited budget

• Get that job at Google

• Get that job at Facebook

• big o cheat sheet

• facebook interviews

• 50+ Data Structure and Algorithms Interview Question for Programmers

• BTree: Fast sorted collections for Swift using in-memory B-trees

• Origin of Quake3's Fast InvSqrt()

• Swift Bitwise Operators

Courses

• Skiena's Algorithms Lectures

• 数据结构与算法之美:Data Structure & Algorithm

• MIT Introduction to algorithms

• MIT Design and Analysis of Algorithms

• Stanford Algorithms

• Planet: 算法时空课程代码