README.md

LeetCode

LeetCode Algorithm

(Notes: "♥" means you need to buy a book from Leetcode)

#	Title	Difficulty	Topics	Solution
1	Two Sum	Easy	Array, Hash Table	golang
2	Add Two Numbers	Medium	Linked List, Math	golang
3	Longest Substring Without Repeating Characters	Medium	Hash Table, Two Pointers, String, Sliding Window	golang, c
4	Median of Two Sorted Arrays	Hard	Array, Binary Search, Divide and Conquer	golang
5	Longest Palindromic Substring	Medium	String, Dynamic Programming	golang
6	ZigZag Conversion	Medium	String	golang
7	Reverse Integer	Easy	Math	golang, c
8	String to Integer (atoi)	Medium	Math, String	golang
10	Regular Expression Matching	Hard	String,Dynamic Programming,Backtracking	golang
12	Integer to Roman	Medium	Math, String	golang
13	Roman to Integer	Easy	Math, String	golang
17	Letter Combinations of a Phone Number	Medium	String, Backtracking	golang
29	Divide Two Integers	Medium	Math, Binary Search	golang
39	Combination Sum	Medium	Array, Backtracking	golang
40	Combination Sum II	Medium	Array, Backtracking	golang
43	Multiply Strings	Medium	Math, String	golang
45	Jump Game II	Hard	Array, Greedy	golang
46	Permutations	Medium	Backtracking	golang
47	Permutations II	Medium	Backtracking	golang
50	Pow(x, n)	Medium	Math, Binary Search	golang
54	Spiral Matrix	Medium	Array	golang
55	Jump Game	Medium	Array, Greedy	golang
57	Insert Interval	Medium	Array	golang, java
59	Spiral Matrix II	Medium	Array	golang
62	Unique Paths	Medium	Array, Dynamic Programming	golang
63	Unique Paths II	Medium	Array, Dynamic Programming	golang
64	Minimum Path Sum	Medium	Array, Dynamic Programming	golang
71	Simplify Path	Medium	String, Stack	golang
73	Set Matrix Zeroes	Medium	Array	golang
74	Search a 2D Matrix	Medium	Array, Binary Search	golang
75	Sort Colors	Medium	Array, Two Pointers, Sort	golang
79	Word Search	Medium	Array, Backtracking	golang
91	Decode Ways	Medium	String, Dynamic Programming	golang
101	Symmetric Tree	Easy	Tree, Depth-first Search,Breadth-first Search	golang
102	Binary Tree Level Order Traversal	Medium	Tree, Breadth-First Search, Binary Tree	golang
103	Binary Tree Zigzag Level Order Traversal	Medium	Tree, Breadth-First Search, Binary Tree	golang
108	Convert Sorted Array to Binary Search Tree	Easy	Tree, Depth-first Search	golang
110	Balanced Binary Tree	Easy	Tree, Depth-first Search	golang
111	Minimum Depth of Binary Tree	Easy	Tree, Depth-first Search,Breadth-first Search	golang
121	Best Time to Buy and Sell Stock	Easy	Array	golang
122	Best Time to Buy and Sell Stock II	Easy	Array, Greedy	golang
125	Valid Palindrome	Easy	String, Two Pointers	golang
168	Excel Sheet Column Title	Easy	Math	golang
171	Excel Sheet Column Number	Easy	Math	golang
172	Factorial Trailing Zeroes	Easy	Math	golang
190	Reverse Bits	Easy	Bit Manipulation	golang
198	House Robber	Easy	Dynamic Programming	golang
199	Binary Tree Right Side View	Medium	Tree, Depth-first-Search, Breadth-first-Search	golang
226	Invert Binary Tree	Easy	Tree	golang
228	Summary Ranges	Easy	Array	golang
257	Binary Tree Paths	Easy	Tree, Depth-first-Search	golang
258	Add Digits	Easy	Math	golang
263	Ugly Number	Easy	Math	golang
264	Ugly Number II	Medium	Math,Dynamic Programming , Heap	golang, c
292	Nim Game	Easy	Brainteaser, Minimax	golang
299	Bulls and Cows	Easy	Hsh Table	golang
326	Power of Three	Easy	Math, Recursion	golang
343	Integer Break	Medium	Math, Dynamic Programming	golang, c
345	Reverse Vowels of a String	Easy	String, Two Pointers	golang
383	Ransom Note	Easy	String, Hash Table	golang
389	Find the Difference	Easy	Hash Table, Bit Manipulation	golang
412	Fizz Buzz	Easy	Math, String, Simulation	golang
485	Max Consecutive Ones	Easy	Array	golang, c
496	Next Greater Element I	Easy	Stack	golang
530	Minimum Absolute Difference in BST	Easy	Tree	golang
532	K-diff Pairs in an Array	Easy	Array, Two Pointers	golang
566	Reshape the Matrix	Easy	Array	golang
654	Maximum Binary Tree	Medium	Tree	golang
687	Longest Univalue Path	Easy	Tree, Recursion	golang
717	1-bit and 2-bit Characters	Easy	Array	golang
783	Minimum Distance Between BST Nodes	Easy	Tree, Recursion	golang
796	Rotate String	Easy	String, String Matching	golang
908	Smallest Range I	Easy	Array, Math	golang
1137	N-th Tribonacci Number	Easy	Recursion	golang
1295	Find Numbers with Even Number of Digits	Easy	Array	golang, c
1446	Consecutive Characters	Easy	String	golang
1749	Maximum Absolute Sum of Any Subarray	Medium	Array, Dynamic Programming	golang
1941	Check if All Characters Have Equal Number	Easy	Hash Table, String, counting	golang

LeetCode Database

#	Title	Difficulty	Solution
175	Combine Two Tables	Easy	MySQL
176	Second Highest Salary	Easy	MySQL
178	Rank Scores	Medium	MySQL
180	Consecutive Numbers	Medium	MySQL
181	Employees Earning More Than Their Managers	Easy	MySQL
182	Duplicate Emails	Easy	MySQL
183	Customers Who Never Order	Easy	MySQL
184	Department Highest Salary	Medium	MySQL
185	Department Top Three Salaries	Hard	MySQL
192	Rising Temperature	Easy	MySQL
196	Delete Duplicate Emails	Easy	MySQL

Offer Problems

#	Title	Difficulty	Solution
offer-03-01	Duplication In Array	Easy	c
offer-03-02	Duplication In Array No Edit		c
offer-04	Find In Partially Sorted Matrix	Easy	c
offer-05	Replace Spaces	Easy	c
offer-06	Print List In Reversed Order	Easy	c
offer-07	Construct Binary Tree	Medium	c
offer-08	Next Node In Binary Tree		c
offer-09	Queue With Two Stacks	Easy	c
offer-10	Fibonacci	Easy	c
offer-11	Min Number In Rotated Array	Easy	c
offer-12	String Path In Matrix	Medium	c
offer-13	Robot Move	Medium	c
offer-14-01	Cutting Rope I	Medium	c
offer-14-02	Cutting Rope II	Medium	c
offer-15	Number Of 1 In Binary	Easy	c
offer-16	Power	Medium	c
offer-17	Print 1 To Max Of N Digits	Easy	c
offer-18-01	Delete Note In List	Easy	c
offer-20	Numeric Strings	Medium	c
offer-21	Reorder Array	Easy	c
offer-22	Kth Node From End	Easy	c
offer-23	Entry Node In List Loop		c
offer-24	Reverse List	Easy	c
offer-25	Merge Sorted Lists	Easy	c
offer-26	Substructure In Tree	Medium	c
offer-27	Mirror Of Binary Tree	Easy	c
offer-28	Symmetrical Binary Tree	Easy	c
offer-29	Print Matrix	Easy	c
offer-30	Mini Stack	Easy	c
offer-31	Stack Push Pop Order	Medium	c
offer-32-01	Print Tree From Top To Bottom	Medium	c
offer-32-02	Print Trees In Lines	Easy	c
offer-32-03	Print Trees In Zigzag	Medium	c
offer-33	Squence Of BST	Medium	c
offer-34	Path In Tree	Medium	c
offer-39	More Than Half Number	Easy	c
offer-40	K Least Numbers	Easy	c
offer-42	Greatest Sum Of Subarrays	Easy	c
offer-47	Max Value Of Gifts	Medium	c
offer-49	Ugly Number	Easy	c
offer-50-01	First Not Repeating Char	Easy	c
offer-52	First Common Nodes In Lists	Easy	c
offer-53-01	Number Of K	Easy	c
offer-53-02	Missing Number	Easy	c
offer-53-03	Integer Identical To Index	Easy	c
offer-54	Kth Node In BST	Easy	c
offer-55-01	Tree Depth	Easy	c
offer-55-02	Balanced Binary Tree	Easy	c
offer-56-01	Numbers Appear Once	Medium	c
offer-56-02	Numbers Appearing Once	Medium	c
offer-57-01	Two Numbers With Sum	Easy	c
offer-57-02	Continuous Squence With Sum	Easy	c
offer-58-01	Reverse Words In Sentence	Easy	c
offer-58-02	Left Rotate String	Easy	c
offer-59-02	Queue With Max	Medium	c
offer-61	Continous Cards	Easy	c
offer-62	Last Number In Circle	Easy	c
offer-63	Maximal Profit	Medium	c
offer-64	Accumulate	Medium	c
offer-65	Add Two Numbers	Easy	c
offer-66	Constuct Array	Easy	c
offer-68-01	Common Parent In Tree	Easy	c
offer-68-02	Common Parent In Tree	Easy	c

interactive-coding-challenges

reference:

haoel-leetcode
LeetCode
lintcode minunit