LeetCode

This repository consists of my solutions to the problems on Leetcode.

The repo is categorized as follows.

LeetCode Algorithms

#	Title	Solution	Difficulty	Topic
1	Two Sum	Java	Easy
144	Binary Tree Preorder Traversal	Java	Medium
26	Remove Duplicates from Sorted Array	Java	Easy
28	Implement strStr()	Java	Easy
167	Two Sum II - Input array is sorted	Java	Easy
27	Remove Element	Java	Easy
2	Add Two Numbers	Java	Medium
349	Intersection of Two Arrays	Java	Easy
9	Palindrome Number	Java	Easy
35	Search Insert Position	Java	Easy
100	Same Tree	Java	Easy
136	Single Number	Java	Easy
58	Length of Last Word	Java, Go	Easy
501	Find Mode in Binary Search Tree	Java	Easy
66	Plus One	Java	Easy
146	LRU Cache	Java	Medium
69	Sqrt(x)	Java	Easy
202	Happy Number	Java / Python	Easy
83	Remove Duplicates from Sorted List	Java	Easy
88	Merge Sorted Array	Java	Easy
500	Keyboard Row	Java	Easy
232	Implement Queue using Stacks	Java	Easy
238	Product of Array Except Self	Java	Medium
387	First Unique Character in a String	Java	Easy
206	Reverse Linked List	Java	Easy
141	Linked List Cycle	Java	Easy
278	First Bad Version	Java	Easy
102	Binary Tree Level Order Traversal	Java	Medium
189	Rotate Array	Java	Easy
20	Valid Parentheses	Java	Easy
21	Merge Two Sorted Lists	Java	Easy
121	Best Time to Buy and Sell Stock	Java	Easy
94	Binary Tree Inorder Traversal	Java	Medium
237	Delete Node in a Linked List	Java	Easy
42	Trapping Rain Water	Java	Hard
98	Validate Binary Search Tree	Java	Medium
145	Binary Tree Postorder Traversal	Java	Hard
155	Min Stack	Java	Easy
173	Binary Search Tree Iterator	Java	Medium
41	First Missing Positive	Java	Hard
268	Missing Number	Java	Easy
53	Maximum Subarray	Java	Easy
138	Copy List with Random Pointer	Java	Medium
412	Fizz Buzz	Java	Easy
937	Reorder Data in Log Files	Java	Easy
200	Number of Islands	Java	Medium
1086	High Five	Java	Easy
977	Squares of a Sorted Array	Java	Easy
953	Verifying an Alien Dictionary	Java	Easy
23	Merge k Sorted Lists	Java	Hard
706	Design HashMap	Java	Easy
819	Most Common Word	Java	Easy
283	Move Zeroes	Java	Easy
49	Group Anagrams	Java	Medium
?	Counting Elements	Java	?
876	Middle of the Linked List	Java	Easy
369	Plus One Linked List	Java	Medium
844	Backspace String Compare	Java	Easy
104	Maximum Depth of Binary Tree	Java	Easy
543	Diameter of Binary Tree	Java	Easy
415	Add Strings	Java	Easy
443	String Compression	Java	Easy
1046	Last Stone Weight	Java	Easy
?	Perform String Shifts	Java	?
525	Contiguous Array	Java	Medium
125	Valid Palindrome	Java	Easy
485	Max Consecutive Ones	Java	Easy
1295	Find Numbers with Even Number of Digits	Java	Easy
678	Valid Parenthesis String	Java	Medium
64	Minimum Path Sum	Java	Medium
33	Search in Rotated Sorted Array	Java	Medium
1008	Construct Binary Search Tree from Preorder Traversal	Java	Medium
?	Leftmost Column with at Least a One	Java	?
560	Subarray Sum Equals K	Java	Medium
201	Bitwise AND of Numbers Range	Java	Medium
55	Jump Game	Java	Medium
221	Maximal Square	Java	Medium
?	First Unique Number	Java	?
124	Binary Tree Maximum Path Sum	Java	Hard
?	Check String Is Valid Sequence from Root to Leaves Path in a Binary Tree	Java	?
448	Find All Numbers Disappeared in an Array	Java	Easy
1089	Duplicate Zeros	Java	Easy
203	Remove Linked List Elements	Java	Easy
896	Monotonic Array	Java	Easy
19	Remove Nth Node From End of List	Java	Medium
101	Symmetric Tree	Java	Easy
234	Palindrome Linked List	Java	Easy
532	K-diff Pairs in an Array	Java	Medium
701	Insert into a Binary Search Tree	Java	Medium
15	3Sum	Java	Medium
704	Binary Search	Java	Easy
449	Serialize and Deserialize BST	Java	Medium
1119	Remove Vowels from a String	Java	Easy
1328	Break a Palindrome	Java	Medium
454	4Sum II	Java	Medium
334	Increasing Triplet Subsequence	Java	Medium
46	Permutations	Java	Medium
1480	Running Sum of 1d Array	Java	Easy
1331	Rank Transform of an Array	Java	Easy
1550	Three Consecutive Odds	Java	Easy
832	Flipping an Image	Java	Easy
1640	Check Array Formation Through Concatenation	Java	Easy
1662	Check If Two String Arrays are Equivalent	Java	Easy
339	Nested List Weight Sum	Java	Easy
112	Path Sum	Java	Easy
169	Majority Element	Java	Easy
1822	Sign of the Product of an Array	Java	Easy
24	Swap Nodes in Pairs	Java	Medium
7	Reverse Integer	Java	Medium
700	Search in a Binary Search Tree	Java	Easy
34	Find First and Last Position of Element in Sorted Array	Java	Medium	Binary Search
744	Find Smallest Letter Greater Than Target	Java	Easy	Binary Search
1768	Merge Strings Alternately	Java	Easy	Arrays
1832	Check if the Sentence Is Pangram	Java	Easy	String
67	Add Binary	Java	Medium	String
540	Single Element in a Sorted Array	Java, Go	Medium	Array