DRAFT.md

LeetCode

LeetCode Algorithm

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

#	Title	Solution	Difficulty
1143	Longest Common Subsequence	Python	Medium
993	Cousins in Binary Tree	C++	Easy
991	Broken Calculator	C++	Medium
990	Satisfiability of Equality Equations	C++	Medium
989	Add to Array-Form of Integer	C++	Easy
988	Smallest String Starting From Leaf	C++	Medium
987	Vertical Order Traversal of a Binary Tree	C++	Medium
986	Interval List Intersections	C++	Medium
985	Sum of Even Numbers After Queries	C++	Easy
984	String Without AAA or BBB	C++	Easy
983	Minimum Cost For Tickets	C++	Medium
981	Time Based Key-Value Store	C++	Medium
980	Unique Paths III	C++	Hard
979	Distribute Coins in Binary Tree	C++	Medium
978	Longest Turbulent Subarray	C++,Python	Medium
977	Squares of a Sorted Array	C++, Python	Easy
976	Largest Perimeter Triangle	C++, Python	Easy
971	Flip Binary Tree To Match Preorder Traversal	Python	Medium
969	Pancake Sorting	Python	Medium
961	N-Repeated element in size 2N Array	C++	Easy
958	Check Completeness of a Binary Tree	Python	Medium
951	Flip Equivalent Binary Trees	Python	Medium
950	Reveal Cards In Increasing Order	Python	Medium
941	Valid Mountain Array	Python	Easy
931	Minimum Falling Path Sum	C++	Medium
922	Sort Array By Parity II	C++	Easy
914	X of a Kind in a Deck of Cards	Python	Easy
905	Sort Array By Parity	C++	Easy
867	Transpose Matrix	Python	Easy
859	Buddy Strings	C++	Easy
858	Mirror Reflection	C++	Medium
852	Peak Index in a Mountain Array	C++	Easy
849	Maximize Distance to Closest Person	Python	Easy
844	Backspace String Compare	C++	Easy
837	Most Common Word	C++	Easy
830	Positions of Large Groups	Python	Easy
804	Unique Morse Code Words	C++	Easy
771	Jewels and Stones	C++	Easy
747	Largest Number At Least Twice of Others	Python	Easy
746	Min Cost Climbing Stairs	C++, Python	Easy
721	Accounts Merge	C++	Medium
718	Maximum Length of Repeated Subarray	Python, Go	Medium
717	1-bit and 2-bit Characters	Python	Easy
714	Best Time to Buy and Sell Stock with Transaction Fee	C++	Medium
712	Minimum ASCII Delete Sum for Two Strings	C++	Medium
695	Max Area of Island	C++	Medium
692	Top K Frequent Words	Python	Medium
687	Longest Univalue Path	Python	Easy
684	Redundant Connection	Python	Medium
674	Longest Continuous Increasing Subsequence	Python	Easy
673	Number of Longest Increasing Subsequence	Python	Medium
671	Second Minimum Node In a Binary Tree	Python	Easy
665	Non-decreasing Array	Python	Easy
662	Maximum Width of Binary Tree	Python	Medium
661	Image Smoother	Python	Easy
655	Print Binary Tree	Python	Medium
653	Two Sum IV - Input is a BST	Python	Easy
652	Find Duplicate Subtrees	Python	Medium
647	Palindromic Substrings	C++	Medium
643	Maximum Average Subarray I	C++, Python	Easy
628	Maximum Product of Three Numbers	Python	Easy
623	Add One Row to Tree	Python	Medium
590	N-ary Tree Postorder Traversal	Python	Easy
589	N-ary Tree Preorder Traversal	Python	Easy
581	Shortest Unsorted Continuous Subarray	Python	Easy
572	Subtree of Another Tree	Python	Easy
566	Reshape the Matrix	Python	Easy
563	Binary Tree Tilt	Python	Easy
561	Array Partition I	Python	Easy
559	Maximum Depth of N-ary Tree	Python	Easy
547	Friend Circles	C++	Medium
543	Diameter of Binary Tree	Python	Easy
538	Convert BST to Greater Tree	Python	Easy
532	K-diff Pairs in an Array	Python	Easy
520	Detect Capital	C++	Easy
518	Coin Change 2	Python	Medium
516	Longest Palindromic Subsequence	Python	Medium
509	Fibonacci Number	Python	Easy
485	Max Consecutive Ones	Python	Medium
477	Total Hamming Distance	C++	Medium
468	Validate IP Address	Python	Medium
463	Island Perimeter	C++	Easy
454	4Sum II	Python	Medium
450	DeleteNodeInABST	Python	Medium
449	Serialize and Deserialize BST	Python	Medium
445	Add Two Numbers II	Python	Medium
438	Find all Anagrams in a string	C++	Medium
437	Path Sum III	Python	Medium
429	N-ary Tree Level Order Traversal	Python	Medium
418	SentenceScreenFitting ♥	C++	Easy
416	Partition Equal Subset Sum	C++	Medium
415	Add Strings	C++	Easy
414	Third Maximum Number	C++, Python	Easy
413	Arithmetic Slices	C++	Medium
412	Fizz Buzz	C++	Easy
410	Split Array Largest Sum	C++	Hard
409	Longest Palindrome	Python	Easy
406	Queue Reconstruction by Height	C++	Medium
405	Convert a Number to Hexadecimal	C++	Easy
404	Sum of Left Leaves	C++, Python	Easy
403	Frog Jump	C++	Hard
402	Remove K Digits	C++	Medium
401	Binary Watch	C++	Easy
400	Nth Digit	C++	Medium
399	Evaluate Division	C++	Medium
398	Random Pick Index	C++	Medium
397	Integer Replacement	C++	Medium
396	Rotate Function	C++	Easy
395	Longest Substring with At Least K Repeating Characters	C++	Medium
394	Decode String	C++	Medium
393	UTF-8 Validation	C++	Medium
392	Is Subsequence	C++	Medium
391	Perfect Rectangle	C++	Hard
390	Elimination Game	C++	Medium
389	Find the Difference	C++	Easy
388	Longest Absolute File Path	C++	Medium
387	First Unique Character in a String	C++	Easy
386	Lexicographical Numbers	C++	Medium
385	Mini Parser	C++	Medium
384	Shuffle an Array	C++	Medium
383	Ransom Note	C++	Easy
382	Linked List Random Node	C++	Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	C++	Hard
380	Insert Delete GetRandom O(1)	C++	Hard
377	Combination Sum IV	Python	Medium
376	Wiggle Subsequence	C++	Medium
371	Sum of Two Integers	Python	Easy
367	Valid Perfect Square	Python	Easy
357	Count Numbers with Unique Digits	C++	Medium
350	Intersection of Two Arrays II	Python	Easy
349	Intersection of Two Arrays	Python	Easy
347	Top K Frequent Elements	Python	Medium
345	Reverse Vowels of a String	Python	Easy
344	Reverse String	Python	Easy
343	Integer Break	C++	Medium
342	Power of Four	Python	Easy
341	Flatten Nested List Iterator	C++	Medium
338	Counting Bits	C++	Medium
337	House Robber III	Python	Medium
336	Palindrome Pairs	C++	Hard
334	Increasing Triplet Subsequence	C++	Medium
332	Reconstruct Itinerary	C++	Medium
331	Verify Preorder Serialization of a Binary Tree	C++	Medium
330	Patching Array	C++	Medium
329	Longest Increasing Path in a Matrix	C++	Medium
328	Odd Even Linked List	Python	Easy
327	Count of Range Sum	C++	Hard
326	Power of Three	Python	Easy
324	Wiggle Sort II	C++	Medium
322	Coin Change	C++	Medium
321	Create Maximum Number	C++	Hard
319	Bulb Switcher	C++	Medium
318	Maximum Product of Word Lengths	C++	Medium
316	Remove Duplicate Letters	C++	Hard
315	Count of Smaller Numbers After Self	C++	Hard
313	Super Ugly Number	C++	Medium
312	Burst Balloons	C++	Hard
310	Minimum Height Trees	C++	Medium
309	Best Time to Buy and Sell Stock with Cooldown	Python	Medium
307	Range Sum Query - Mutable	C++	Medium
306	Additive Number	C++	Medium
304	Range Sum Query 2D - Immutable	C++	Medium
303	Range Sum Query - Immutable	Python	Easy
301	Remove Invalid Parentheses	C++	Hard
300	Longest Increasing Subsequence	Python	Medium
299	Bulls and Cows	C++	Easy
297	Serialize and Deserialize Binary Tree	C++	Medium
295	Find Median from Data Stream	C++	Hard
292	Nim Game	Python	Easy
290	Word Pattern	Python	Easy
289	Game of Life	C++	Medium
287	Find the Duplicate Number	C++, Python	Hard
285	Inorder Successor in BST ♥	Java	Medium
284	Peeking Iterator	C++	Medium
283	Move Zeroes	Python	Easy
282	Expression Add Operators	C++	Hard
279	Perfect Squares	C++	Medium
278	First Bad Version	Python	Easy
275	H-Index II	C++	Medium
274	H-Index	C++	Medium
273	Integer to English Words	C++	Medium
268	Missing Number	Python	Medium
264	Ugly Number II	C++	Medium
263	Ugly Number	Python	Easy
260	Single Number III	C++	Medium
258	Add Digits	Python	Easy
257	Binary Tree Paths	Python	Easy
242	Valid Anagram	Python	Easy
241	Different Ways to Add Parentheses	Python	Medium
240	Search a 2D Matrix II	C++, Java, Python	Medium
239	Sliding Window Maximum	C++	Hard
238	Product of Array Except Self	Python	Medium
237	Delete Node in a Linked List	Python	Easy
236	Lowest Common Ancestor of a Binary Tree	Python	Medium
235	Lowest Common Ancestor of a Binary Search Tree	Python	Easy
234	Palindrome Linked List	Python	Easy
233	Number of Digit One	C++	Medium
232	Implement Queue using Stacks	Python	Easy
231	Power of Two	Python	Easy
230	Kth Smallest Element in a BST	C++, Python	Medium
229	Majority Element II	C++	Medium
228	Summary Ranges	Python	Easy
227	Basic Calculator II	C++	Medium
226	Invert Binary Tree	Python	Easy
225	Implement Stack using Queues	Python	Medium
224	Basic Calculator	Python	Medium
223	Rectangle Area	C++	Easy
222	Count Complete Tree Nodes	C++, Python	Medium
221	Maximal Square	Python	Medium
220	Contains Duplicate III	C++, Python	Medium
219	Contains Duplicate II	Python	Easy
218	The Skyline Problem	C++	Hard
217	Contains Duplicate	Python	Easy
216	Combination Sum III	C++	Medium
215	Kth Largest Element in an Array	C++	Medium
214	Shortest Palindrome	C++	Hard
213	House Robber II	Python	Medium
212	Word Search II	C++	Hard
211	Add and Search Word - Data structure design	C++	Medium
210	Course Schedule II	C++	Medium
209	Minimum Size Subarray Sum	C++	Medium
208	Implement Trie (Prefix Tree)	C++	Medium
207	Course Schedule	C++	Medium
206	Reverse Linked List	Python	Easy
205	Isomorphic Strings	Python	Easy
204	Count Primes	Python	Easy
203	Remove Linked List Elements	Python	Easy
202	Happy Number	Python	Easy
201	Bitwise AND of Numbers Range	C++	Medium
200	Number of Islands	Python	Medium
199	Binary Tree Right Side View	Python	Medium
198	House Robber	Python	Easy
191	Number of 1 Bits	Python	Easy
190	Reverse Bits	Python	Easy
189	Rotate Array	Python	Easy
188	Best Time to Buy and Sell Stock IV	Python	Hard
187	Repeated DNA Sequences	C++	Medium
186	Reverse Words in a String II ♥	C++	Medium
179	Largest Number	C++	Medium
174	Dungeon Game	C++	Hard
173	Binary Search Tree Iterator	C++, Java, Python	Medium
172	Factorial Trailing Zeroes	Python	Easy
171	Excel Sheet Column Number	Python	Easy
170	Two Sum III - Data structure design ♥	C++	Easy
169	Majority Element	Python	Easy
168	Excel Sheet Column Title	Python	Easy
167	Two Sum II - Input array is sorted ♥	Python	Medium
166	Fraction to Recurring Decimal	C++	Medium
165	Compare Version Numbers	C++	Easy
164	Maximum Gap	C++	Hard
163	Missing Ranges ♥	C++	Medium
162	Find Peak Element	C++, Java	Medium
161	One Edit Distance♥	C++	Medium
160	Intersection of Two Linked Lists	Python	Easy
159	Longest Substring with At Most Two Distinct Characters ♥	C++	Hard
158	Read N Characters Given Read4 II - Call multiple times ♥	C++	Hard
157	Read N Characters Given Read4 ♥	C++	Easy
156	Binary Tree Upside Down ♥	C++	Medium
155	Min Stack	C++, Java	Easy
154	Find Minimum in Rotated Sorted Array II	C++	Hard
153	Find Minimum in Rotated Sorted Array	C++, Java	Medium
152	Maximum Product Subarray	Python	Medium
151	Reverse Words in a String	C++, Java	Medium
150	Evaluate Reverse Polish Notation	Python	Medium
149	Max Points on a Line	C++	Hard
148	Sort List	C++, Python	Medium
147	Insertion Sort List	C++, Python	Medium
146	LRU Cache	Python	Hard
145	Binary Tree Postorder Traversal	Python	Hard
144	Binary Tree Preorder Traversal	Python	Medium
143	Reorder List	C++, Python	Medium
142	Linked List Cycle II	C++, Python	Medium
141	Linked List Cycle	Python	Medium
140	Word Break II	C++	Hard
139	Word Break	C++	Medium
138	Copy List with Random Pointer	C++, Python	Hard
137	Single Number II	C++	Medium
136	Single Number	Python	Medium
135	Candy	C++	Hard
134	Gas Station	C++	Medium
133	Clone Graph	C++	Medium
132	Palindrome Partitioning II	C++	Hard
131	Palindrome Partitioning	C++	Medium
130	Surrounded Regions	C++	Medium
129	Sum Root to Leaf Numbers	C++, Python	Medium
128	Longest Consecutive Sequence	Python	Hard
127	Word Ladder	C++	Medium
126	Word Ladder II	C++	Hard
125	Valid Palindrome	Python	Easy
124	Binary Tree Maximum Path Sum	C++, Java	Hard
123	Best Time to Buy and Sell Stock III	Python	Hard
122	Best Time to Buy and Sell Stock II	Python	Medium
121	Best Time to Buy and Sell Stock	Python	Medium
120	Triangle	Python	Medium
119	Pascal's Triangle II	Python	Easy
118	Pascal's Triangle	Python	Easy
117	Populating Next Right Pointers in Each Node II	C++, Python	Hard
116	Populating Next Right Pointers in Each Node	C++, Python	Medium
115	Distinct Subsequences	Python	Hard
114	Flatten Binary Tree to Linked List	C++, Python	Medium
113	Path Sum II	C++, Python	Medium
112	Path Sum	Python	Easy
111	Minimum Depth of Binary Tree	Python	Easy
110	Balanced Binary Tree	C++, Java	Easy
109	Convert Sorted List to Binary Search Tree	C++	Medium
108	Convert Sorted Array to Binary Search Tree	C++	Medium
107	Binary Tree Level Order Traversal II	Python	Easy
106	Construct Binary Tree from Inorder and Postorder Traversal	Python	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	Python	Medium
104	Maximum Depth of Binary Tree	Python	Easy
103	Binary Tree Zigzag Level Order Traversal	Python	Medium
102	Binary Tree Level Order Traversal	Python	Easy
101	Symmetric Tree	Python	Easy
100	Same Tree	Python	Easy
099	Recover Binary Search Tree	C++	Hard
098	Validate Binary Search Tree	Python	Medium
097	Interleaving String	C++	Hard
096	Unique Binary Search Trees	Python	Medium
095	Unique Binary Search Trees II	Python	Medium
094	Binary Tree Inorder Traversal	Python	Medium
093	Restore IP Addresses	C++	Medium
092	Reverse Linked List II	Python	Medium
091	Decode Ways	C++	Medium
090	Subsets II	C++, Java	Medium
089	Gray Code	C++	Medium
088	Merge Sorted Array	Python	Easy
087	Scramble String	C++	Hard
086	Partition List	C++, Python	Medium
085	Maximal Rectangle	C++	Hard
084	Largest Rectangle in Histogram	C++	Hard
083	Remove Duplicates from Sorted List	Python	Easy
082	Remove Duplicates from Sorted List II	C++, Python	Medium
081	Search in Rotated Sorted Array II	C++	Medium
080	Remove Duplicates from Sorted Array II	C++	Medium
079	Word Search	C++	Medium
078	Subsets	Python	Medium
077	Combinations	Python, Go	Medium
076	Minimum Window Substring	Python	Hard
075	Sort Colors	Python	Medium
074	Search a 2D Matrix	Python	Medium
073	Set Matrix Zeroes	Python	Medium
072	Edit Distance	Python	Hard
071	Simplify Path	C++	Medium
070	Climbing Stairs	Python	Easy
069	Sqrt(x)	Python	Medium
068	Text Justification	C++	Hard
067	Add Binary	C++	Easy
066	Plus One	Python	Easy
065	Valid Number	C++	Easy
064	Minimum Path Sum	Python, Go	Medium
063	Unique Paths II	Python	Medium
062	Unique Paths	Python	Medium
061	Rotate List	C++	Medium
060	Permutation Sequence	C++	Medium
059	Spiral Matrix II	C++	Medium
058	Length of Last Word	Python	Easy
057	Insert Interval	C++	Hard
056	Merge Intervals	C++	Hard
055	Jump Game	C++	Medium
054	Spiral Matrix	C++	Medium
053	Maximum Subarray	Python	Medium
052	N-Queens II	Python	Hard
051	N-Queens	Python	Hard
050	"Pow(x, n)"	C++, Java	Medium
049	Group Anagrams	Python	Medium
048	Rotate Image	C++	Medium
047	Permutations II	Python	Hard
046	Permutations	Python	Medium
045	Jump Game II	C++	Hard
044	Wildcard Matching	Python	Hard
043	Multiply Strings	Python	Medium
042	Trapping Rain Water	Python, Go	Hard
041	First Missing Positive	Python	Hard
040	Combination Sum II	Python	Medium
039	Combination Sum	Python	Medium
038	Count and Say	Python	Easy
037	Sudoku Solver	C++	Hard
036	Valid Sudoku	C++	Easy
035	Search Insert Position	Python	Medium
034	Search for a Range	Python)	Medium
033	Search in Rotated Sorted Array	Python	Hard
032	Longest Valid Parentheses	Python	Hard
031	Next Permutation	Python	Medium
030	Substring with Concatenation of All Words	C++	Hard
029	Divide Two Integers	Python	Medium
028	Implement strStr()	Python	Easy
027	Remove Element	Python	Easy
026	Remove Duplicates from Sorted Array	Python	Easy
025	Reverse Nodes in k-Group	C++	Hard
024	Swap Nodes in Pairs	Python	Medium
023	Merge k Sorted Lists	Python	Hard
022	Generate Parentheses	Python	Medium
021	Merge Two Sorted Lists	Python	Easy
020	Valid Parentheses	Python	Easy
019	Remove Nth Node From End of List	Python	Easy
018	4Sum	Python	Medium
017	Letter Combinations of a Phone Number	Python	Medium
016	3Sum Closest	Python	Medium
015	3Sum	Python	Medium
014	Longest Common Prefix	Python	Easy
013	Roman to Integer	Python	Easy
012	Integer to Roman	Python	Medium
011	Container With Most Water	Python	Medium
010	Regular Expression Matching	C++	Hard
009	Palindrome Number	Python	Easy
008	String to Integer (atoi)	Python	Easy
007	Reverse Integer	Python	Easy
006	ZigZag Conversion	Python	Easy
005	Longest Palindromic Substring	Python	Medium
004	Median of Two Sorted Arrays	Python	Hard
003	Longest Substring Without Repeating Characters	Python	Medium
002	Add Two Numbers	Python	Medium
001	Two Sum	Python	Easy

LeetCode Shell

#	Title	Solution	Difficulty
1	Word Frequency	Bash	Medium
2	Valid Phone Numbers	Bash	Easy
3	Transpose File	Bash	Medium
4	Tenth Line	Bash	Easy

LintCode

#	Title	Solution	Difficulty
1	Search in a big sorted array	Java	Medium
2	Search Range in Binary Search Tree	Java	Medium