LeetCode

#	Problem	Difficulty	Solution
1	Two Sum	Easy	Python
2	Add Two Numbers	Medium	Python
3	Longest Substring Without Repeating Characters	Medium	Python
4	Median of Two Sorted Arrays	Hard	Python
5	Longest Palindromic Substring	Medium	Python
6	ZigZag Conversion	Medium	Python
7	Reverse Integer	Easy	Python
8	String to Integer (atoi)	Medium	Python
9	Palindrome Number	Easy	Python
11	Container With Most Water	Medium	Python
12	Integer to Roman	Medium	Python
13	Roman to Integer	Easy	Python
14	Longest Common Prefix	Easy	Python
15	3Sum	Medium	Python
16	3Sum Closest	Medium	Python
17	Letter Combinations of a Phone Number	Medium	Python
18	4Sum	Medium	Python
19	Remove Nth Node From End of List	Medium	Python
20	Valid Parentheses	Easy	Python
21	Merge Two Sorted Lists	Easy	Python
22	Generate Parentheses	Medium	Python
23	Merge k Sorted Lists	Hard	Python
24	Swap Nodes in Pairs	Medium	Python
26	Remove Duplicates from Sorted Array	Easy	Python
27	Remove Element	Easy	Python
28	Implement strStr()	Easy	Python
29	Divide Two Integers	Medium	Python
31	Next Permutation	Medium	Python
34	Find First and Last Position of Element in Sorted Array	Medium	Python
35	Search Insert Position	Easy	Python
36	Valid Sudoku	Medium	Python
37	Sudoku Solver	Hard	Python
38	Count and Say	Easy	Python
39	Combination Sum	Medium	Python
40	Combination Sum II	Medium	Python
42	Trapping Rain Water	Hard	Python
46	Permutations	Medium	Python
47	Permutations II	Medium	Python
49	Group Anagrams	Medium	Python
50	Pow(x, n)	Medium	Python
51	N-Queens	Hard	Python
52	N-Queens II	Hard	Python
53	Maximum Subarray	Easy	Python
54	Spiral Matrix	Medium	Python
56	Merge Intervals	Medium	Python
58	Length of Last Word	Easy	Python
62	Unique Paths	Medium	Python
63	Unique Paths II	Medium	Python
64	Minimum Path Sum	Medium	Python
66	Plus One	Easy	Python
67	Add Binary	Easy	Python
69	Sqrt(x)	Easy	Python
70	Climbing Stairs	Easy	Python
73	Set Matrix Zeroes	Medium	Python
75	Sort Colors	Medium	Python
76	Minimum Window Substring	Hard	Python
78	Subsets	Medium	Python
79	Word Search	Medium	Python
83	Remove Duplicates from Sorted List	Easy	Python
88	Merge Sorted Array	Easy	Python
90	Subsets II	Medium	Python
98	Validate Binary Search Tree	Medium	Python
100	Same Tree	Easy	Python
101	Symmetric Tree	Easy	Python
104	Maximum Depth of Binary Tree	Easy	Python
107	Binary Tree Level Order Traversal II	Easy	Python
108	Convert Sorted Array to Binary Search Tree	Easy	Python
110	Balanced Binary Tree	Easy	Python
111	Minimum Depth of Binary Tree	Easy	Python
112	Path Sum	Easy	Python
113	Path Sum II	Medium	Python
118	Pascal's Triangle	Easy	Python
119	Pascal's Triangle II	Easy	Python
121	Best Time to Buy and Sell Stock	Easy	Python
122	Best Time to Buy and Sell Stock II	Easy	Python
123	Best Time to Buy and Sell Stock III	Hard	Python
124	Binary Tree Maximum Path Sum	Hard	Python
125	Valid Palindrome	Easy	Python
136	Single Number	Easy	Python
137	Single Number II	Medium	Python
138	Copy List with Random Pointer	Medium	Python
139	Word Break	Medium	Python
140	Word Break II	Hard	Python
141	Linked List Cycle	Easy	Python
142	Linked List Cycle II	Medium	Python
146	LRU Cache	Hard	Python
149	Max Points on a Line	Hard	Python
151	Reverse Words in a String	Medium	Python
155	Min Stack	Easy	Python
157	Read N Characters Given Read4	Easy	Python
159	Longest Substring with At Most Two Distinct Characters	Hard	Python
163	Missing Ranges	Medium	Python
167	Two Sum II - Input array is sorted	Easy	Python
169	Majority Element	Easy	Python
171	Excel Sheet Column Number	Easy	Python
173	Binary Search Tree Iterator	Medium	Python
174	Dungeon Game	Hard	Python
186	Reverse Words in a String II	Medium	Python
189	Rotate Array	Easy	Python
191	Number of 1 Bits	Easy	Python
198	House Robber	Easy	Python
200	Number of Islands	Medium	Python
203	Remove Linked List Elements	Easy	Python
204	Count Primes	Easy	Python
205	Isomorphic Strings	Easy	Python
206	Reverse Linked List	Easy	Python
208	Implement Trie (Prefix Tree)	Medium	Python
212	Word Search II	Hard	Python
213	House Robber II	Medium	Python
215	Kth Largest Element in an Array	Medium	Python
216	Combination Sum III	Medium	Python
217	Contains Duplicate	Easy	Python
218	The Skyline Problem	Hard	Python
219	Contains Duplicate II	Easy	Python
220	Contains Duplicate III	Medium	Python
222	Count Complete Tree Nodes	Medium	Python
226	Invert Binary Tree	Easy	Python
230	Kth Smallest Element in a BST	Medium	Python
232	Implement Queue using Stacks	Easy	Python
234	Palindrome Linked List	Easy	Python
237	Delete Node in a Linked List	Easy	Python
239	Sliding Window Maximum	Hard	Python
242	Valid Anagram	Easy	Python
243	Shortest Word Distance	Easy	Python
246	Strobogrammatic Number	Easy	Python
247	Strobogrammatic Number II	Medium	Python
250	Count Univalue Subtrees	Medium	Python
256	Paint House	Easy	Python
258	Add Digits	Easy	Python
259	3Sum Smaller	Medium	Python
263	Ugly Number	Easy	Python
265	Paint House II	Hard	Python
266	Palindrome Permutation	Easy	Python
268	Missing Number	Easy	Python
269	Alien Dictionary	Hard	Python
270	Closest Binary Search Tree Value	Easy	Python
271	Encode and Decode Strings	Medium	Python
276	Paint Fence	Easy	Python
278	First Bad Version	Easy	Python
283	Move Zeroes	Easy	Python
284	Peeking Iterator	Medium	Python
285	Inorder Successor in BST	Medium	Python
288	Unique Word Abbreviation	Medium	Python
289	Game of Life	Medium	Python
292	Nim Game	Easy	Python
293	Flip Game	Easy	Python
295	Find Median from Data Stream	Hard	Python
297	Serialize and Deserialize Binary Tree	Easy	Python
298	Binary Tree Longest Consecutive Sequence	Medium	Python
299	Bulls and Cows	Medium	Python
303	Range Sum Query - Immutable	Easy	Python
304	Range Sum Query 2D - Immutable	Medium	Python
305	Number of Islands II	Hard	Python
307	Range Sum Query - Mutable	Medium	Python
318	Maximum Product of Word Lengths	Medium	Python
322	Coin Change	Medium	Python
339	Nested List Weight Sum	Easy	Python
340	Longest Substring with At Most K Distinct Characters	Hard	Python
344	Reverse String	Easy	Python
345	Reverse Vowels of a String	Easy	Python
346	Moving Average from Data Stream	Easy	Python
348	Design Tic-Tac-Toe	Medium	Python
349	Intersection of Two Arrays	Easy	Python
350	Intersection of Two Arrays II	Easy	Python
356	Line Reflection	Medium	Python
359	Logger Rate Limiter	Easy	Python
361	Bomb Enemy	Medium	Python
362	Design Hit Counter	Medium	Python
371	Sum of Two Integers	Easy	Python
374	Guess Number Higher or Lower	Easy	Python
377	House Robber III	Medium	Python
380	Insert Delete GetRandom O(1)	Medium	Python
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Python
383	Ransom Note	Easy	Python
387	First Unique Character in a String	Easy	Python
388	Longest Absolute File Path	Medium	Python
389	Find the Difference	Easy	Python
393	UTF-8 Validation	Medium	Python
399	Evaluate Division	Medium	Python
401	Binary Watch	Easy	Python
412	Fizz Buzz	Easy	Python
415	Add Strings	Easy	Python
418	Sentence Screen Fitting	Medium	Python
422	Valid Word Square	Easy	Python
425	Word Squares	Hard	Python
429	N-ary Tree Level Order Traversal	Easy	Python
437	Path Sum III	Easy	Python
438	Find All Anagrams in a String	Easy	Python
443	String Compression	Easy	Python
448	Find All Numbers Disappeared in an Array	Easy	Python
453	Minimum Moves to Equal Array Elements	Easy	Python
461	Hamming Distance	Easy	Python
462	Minimum Moves to Equal Array Elements II	Medium	Python
463	Island Perimeter	Easy	Python
475	Heaters	Easy	Python
476	Number Complement	Easy	Python
477	Number of Boomerangs	Easy	Python
480	Sliding Window Median	Hard	Python
482	License Key Formatting	Easy	Python
485	Max Consecutive Ones	Easy	Python
496	Next Greater Element I	Easy	Python
498	Robot Room Cleaner	Hard	Python
500	Keyboard Row	Easy	Python
509	Fibonacci Number	Easy	Python
520	Detect Capital	Easy	Python
521	Longest Uncommon Subsequence I	Easy	Python
531	Lonely Pixel I	Medium	Python
539	Minimum Time Difference	Medium	Python
543	Diameter of Binary Tree	Easy	Python
552	Subtree of Another Tree	Easy	Python
557	Reverse Words in a String III	Easy	Python
559	Maximum Depth of N-ary Tree	Easy	Python
561	Array Partition I	Easy	Python
575	Distribute Candies	Easy	Python
589	N-ary Tree Preorder Traversal	Easy	Python
590	N-ary Tree Postorder Traversal	Easy	Python
616	Add Bold Tag in String	Medium	Python
617	Merge Two Binary Trees	Easy	Python
628	Maximum Product of Three Numbers	Easy	Python
637	Average of Levels in Binary Tree	Easy	Python
642	Design Search Autocomplete System	Hard	Python
653	Two Sum IV - Input is a BST	Easy	Python
657	Robot Return to Origin	Easy	Python
658	Find K Closest Elements	Medium	Python
659	Split Array into Consecutive Subsequences	Medium	Python
666	Path Sum IV	Medium	Python
669	Trim a Binary Search Tree	Easy	Python
671	Second Minimum Node in a Binary Tree	Easy	Python
681	Next Closest Time	Medium	Python
682	Baseball Game	Easy	Python
683	K Empty Slots	Hard	Python
686	Repeated String Match	Easy	Python
687	Longest Univalue Path	Easy	Python
690	Employee Importance	Easy	Python
693	Binary Number with Alternating Bits	Easy	Python
694	Number of Distinct Islands	Medium	Python
695	Max Area of Island	Medium	Python
697	Degree of an Array	Easy	Python
700	Search in a Binary Search Tree	Easy	Python
703	Kth Largest Element in a Stream	Easy	Python
706	Design HashMap	Easy	Python
708	Insert into a Cyclic Sorted List	Medium	Python
709	To Lower Case	Easy	Python
716	Max Stack	Easy	Python
717	1-bit and 2-bit Characters	Easy	Python
724	Find Pivot Index	Easy	Python
728	Self Dividing Numbers	Easy	Python
729	My Calendar I	Medium	Python
731	My Calendar II	Medium	Python
733	Flood Fill	Easy	Python
734	Sentence Similarity	Easy	Python
741	Cherry Pickup	Hard	Python
746	Min Cost Climbing Stairs	Easy	Python
748	Shortest Completing Word	Easy	Python
760	Find Anagram Mappings	Easy	Python
762	Prime Number of Set Bits in Binary Representation	Easy	Python
765	Couples Holding Hands	Hard	Python
766	Toeplitz Matrix	Easy	Python
771	Jewels and Stones	Easy	Python
784	Letter Case Permutation	Easy	Python
794	Valid Tic-Tac-Toe State	Medium	Python
796	Rotate String	Easy	Python
804	Unique Morse Code Words	Easy	Python
806	Number of Lines to Write String	Easy	Python
811	Subdomain Visit Count	Easy	Python
812	Largest Triangle Area	Easy	Python
819	Most Common Word	Easy	Python
821	Shortest Distance to a Character	Easy	Python
824	Goat Latin	Easy	Python
832	Flipping an Image	Easy	Python
833	Find And Replace in String	Medium	Python
843	Guess the Word	Hard	Python
844	Backspace String Compare	Easy	Python
849	Maximize Distance to Closest Person	Easy	Python
852	Peak Index in a Mountain Array	Easy	Python
854	K-Similar Strings	Hard	Python
857	Minimum Cost to Hire K Workers	Hard	Python
860	Lemonade Change	Easy	Python
867	Transpose Matrix	Easy	Python
868	Binary Gap	Easy	Python
871	Minimum Number of Refueling Stops	Hard	Python
873	Length of Longest Fibonacci Subsequence	Medium	Python
876	Middle of the Linked List	Easy	Python
883	Projection Area of 3D Shapes	Easy	Python
884	Uncommon Words from Two Sentences	Easy	Python
888	Fair Candy Swap	Easy	Python
892	Surface Area of 3D Shapes	Easy	Python
896	Monotonic Array	Easy	Python
897	Increasing Order Search Tree	Easy	Python
904	Fruit into Baskets	Medium	Python
905	Sort Array by Parity	Easy	Python
908	Smallest Range I	Easy	Python
909	Snakes and Ladders	Medium	Python
910	Smallest Range II	Medium	Python
911	Online Election	Medium	Python
913	Cat and Mouse	Hard	Python
914	X of a Kind in a Deck of Cards	Easy	Python
915	Partition Array into Disjoint Intervals	Medium	Python
916	Word Subsets	Medium	Python
917	Reverse Only Letters	Easy	Python
922	Sort Array By Parity II	Easy	Python
929	Unique Email Addresses	Easy	Python
931	Minimum Falling Path Sum	Medium	Python
933	Number of Recent Calls	Easy	Python
941	Valid Mountain Array	Easy	Python
942	DI String Match	Easy	Python
944	Delete Columns to Make Sorted	Medium	Python
945	Minimum Increment to Make Array Unique	Medium	Python
946	Validate Stack Sequences	Medium	Python
947	Most Stones Removed with Same Row or Columns	Hard	Python
948	Bag of Tokens	Medium	Python
953	Verifying an Alien Dictionary	Easy	Python
961	N-Repeated Element in Size 2N Array	Easy	Python
965	Univalued Binary Tree	Easy	Python
973	K Closest Points to Origin	Easy	Python
977	Squares of a Sorted Array	Easy	Python
985	Sum of Even Numbers After Queries	Easy	Python
1002	Find Common Characters	Easy	Python
1003	Check If Word Is Valid After Substitutions	Medium	Python
1004	Max Consecutive Ones III	Medium	Python