Solutions to LeetCode Problems

#	Title
1	Two Sum
2	Add Two Numbers
3	Longest Substring Without Repeating Characters
7	Reverse Integer
9	Palindrome Number
11	Container With Most Water
12	Integer to Roman
13	Roman to Integer
14	Longest Common Prefix
20	Valid Parentheses
21	Merge Two Sorted Lists
24	Swap Nodes in Pairs
26	Remove Duplicates from Sorted Array
27	Remove Element
28	Implement strStr()
31	Next Permutation
33	Search in Rotated Sorted Array
35	Search Insert Position
38	Count and Say
41	First Missing Positive
46	Permutations
47	Permutations II
49	Group Anagrams
51	N-Queens
52	N-Queens II
53	Maximum Subarray
54	Spiral Matrix
55	Jump Game
56	Merge Intervals
58	Length of Last Word
64	Minimum Path Sum
66	Plus One
67	Add Binary
69	Sqrt(x)
70	Climbing Stairs
78	Subsets
80	Remove Duplicates from Sorted Array II
83	Remove Duplicates from Sorted List
88	Merge Sorted Array
89	Gray Code
90	Subsets II
94	Binary Tree Inorder Traversal
100	Same Tree
101	Symmetric Tree
102	Binary Tree Level Order Traversal
104	Maximum Depth of Binary Tree
105	Construct Binary Tree from Preorder and Inorder Traversal
106	Construct Binary Tree from Inorder and Postorder Traversal
107	Binary Tree Level Order Traversal II
108	Convert Sorted Array to Binary Search Tree
110	Balanced Binary Tree
111	Minimum Depth of Binary Tree
112	Path Sum
116	Populating Next Right Pointers in Each Node
118	Pascal's Triangle
119	Pascal's Triangle II
121	Best Time to Buy and Sell Stock
122	Best Time to Buy and Sell Stock II
124	Binary Tree Maximum Path Sum
125	Valid Palindrome
127	Word Ladder
136	Single Number
139	Word Break
141	Linked List Cycle
144	Binary Tree Preorder Traversal
145	Binary Tree Postorder Traversal
146	LRU Cache
150	Evaluate Reverse Polish Notation
155	Min Stack
153	Find Minimum in Rotated Sorted Array
160	Intersection of Two Linked Lists
167	Two Sum II - Input array is sorted
168	Excel Sheet Column Title
169	Majority Element
171	Excel Sheet Column Number
172	Factorial Trailing Zeroes
189	Rotate Array
190	Reverse Bits
191	Number of 1 Bits
198	House Robber
200	Number of Islands
201	Bitwise AND of Numbers Range
202	Happy Number
203	Remove Linked List Elements
204	Count Primes
205	Isomorphic Strings
206	Reverse Linked List
208	Implement Trie (Prefix Tree)
217	Contains Duplicate
219	Contains Duplicate II
221	Maximal Square
222	Count Complete Tree Nodes
225	Implement Stack using Queues
226	Invert Binary Tree
228	Summary Ranges
230	Kth Smallest Element in a BST
231	Power of Two
232	Implement Queue using Stacks
234	Palindrome Linked List
235	Lowest Common Ancestor of a Binary Search Tree
237	Delete Node in a Linked List
238	Product of Array Except Self
242	Valid Anagram
257	Binary Tree Paths
258	Add Digits
263	Ugly Number
268	Missing Number
274	H-Index
278	First Bad Version
283	Move Zeroes
290	Word Pattern
292	Nim Game
299	Bulls and Cows
303	Range Sum Query - Immutable
309	Best Time to Buy and Sell Stock with Cooldown
322	Coin Change
326	Power of Three
328	Odd Even Linked List
338	Counting Bits
342	Power of Four
344	Reverse String
345	Reverse Vowels of a String
349	Intersection of Two Arrays
350	Intersection of Two Arrays II
354	Russian Doll Envelopes
367	Valid Perfect Square
374	Guess Number Higher or Lower
376	Wiggle Subsequence
383	Ransom Note
387	First Unique Character in a String
389	Find the Difference
392	Is Subsequence
394	Decode String
402	Remove K Digits
403	Frog Jump
404	Sum of Left Leaves
405	Convert a Number to Hexadecimal
409	Longest Palindrome
412	Fizz Buzz
414	Third Maximum Number
415	Add Strings
416	Partition Equal Subset Sum
417	Pacific Atlantic Water Flow
423	Reconstruct Original Digits from English
434	Number of Segments in a String
438	Find All Anagrams in a String
441	Arranging Coins
448	Find All Numbers Disappeared in an Array
451	Sort Characters By Frequency
455	Assign Cookies
459	Repeated Substring Pattern
461	Hamming Distance
463	Island Perimeter
476	Number Complement
478	Generate Random Point in a Circle
482	License Key Formatting
485	Max Consecutive Ones
492	Construct the Rectangle
495	Teemo Attacking
498	Diagonal Traverse
500	Keyboard Row
504	Base 7
506	Relative Ranks
507	Perfect Number
509	Fibonacci Number
520	Detect Capital
525	Contiguous Array
535	Encode and Decode TinyURL
540	Single Element in a Sorted Array
543	Diameter of Binary Tree
560	Subarray Sum Equals K
561	Array Partition
567	Permutation in String
575	Distribute Candies
623	Add One Row to Tree
637	Average of Levels in Binary Tree
643	Maximum Average Subarray I
645	Set Mismatch
647	Palindromic Substrings
678	Valid Parenthesis String
680	Valid Palindrome II
682	Baseball Game
697	Degree of an Array
700	Search in a Binary Search Tree
706	Design HashMap
709	To Lower Case
714	Best Time to Buy and Sell Stock with Transaction Fee
721	Accounts Merge
724	Find Pivot Index
728	Self Dividing Numbers
733	Flood Fill
747	Largest Number At Least Twice of Others
771	Jewels and Stones
775	Global and Local Inversions
820	Short Encoding of Words
823	Binary Trees With Factors
836	Rectangle Overlap
841	Keys and Rooms
844	Backspace String Compare
869	Reordered Power of 2
870	Advantage Shuffle
876	Middle of the Linked List
883	Projection Area of 3D Shapes
884	Uncommon Words from Two Sentences
886	Possible Bipartition
901	Online Stock Span
905	Sort Array By Parity
912	Sort an Array
916	Word Subsets
918	Maximum Sum Circular Subarray
923	3Sum With Multiplicity
935	Knight Dialer
938	Range Sum of BST
941	Valid Mountain Array
966	Vowel Spellchecker
971	Flip Binary Tree To Match Preorder Traversal
977	Squares of a Sorted Array
979	Distribute Coins in Binary Tree
984	String Without AAA or BBB
993	Cousins in Binary Tree
997	Find the Town Judge
1008	Construct Binary Search Tree from Preorder Traversal
1009	Complement of Base 10 Integer
1046	Last Stone Weight
1089	Duplicate Zeros
1051	Height Checker
1143	Longest Common Subsequence
1207	Unique Number of Occurrences
1232	Check If It Is a Straight Line
1277	Count Square Submatrices with All Ones
1295	Find Numbers with Even Number of Digits
1332	Remove Palindromic Subsequences
1386	Cinema Seat Allocation
1394	Find Lucky Integer in an Array
1396	Design Underground System
1426	Counting Elements
1427	Perform String Shifts
1428	Leftmost Column with at Least a One
1429	First Unique Number
1430	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree
1461	Check If a String Contains All Binary Codes of Size K
1572	Matrix Diagonal Sum
1672	Richest Customer Wealth
1721	Swapping Nodes in a Linked List
1807	Evaluate the Bracket Pairs of a String
1971	Find if Path Exists in Graph
2215	Find the Difference of Two Arrays
2225	Find Players With Zero or One Losses

Problems solved: 248