Leetcode-Solution

Leetcode problems have been solved and tagged with difficulties of easy, medium, and hard. Languages used are also provided.

• Python
• Java
• C

Problems and Solutions

#	Problem	Solution	Difficulty	Tags
1	Two Sum	Java	Easy	Array, Hash Table
2	Add Two Numbers	Java	Medium	LinkedList, Math
7	Reverse Integer	Java	Medium	Math
9	Palindrome Number	Java	Easy	Math
11	Container With Most Water	Java	Medium	Two Pointers
12	Integer to Roman	Java	Medium	String
14	Longest Common Prefix	Java	Easy	String
15	3Sum	Python3	Medium	Two pointers, Sorting
18	4Sum	Python3	Medium	Two pointers, Sorting
21	Merge Two Sorted Lists	Java	Easy	LinkedList
22	Generate Parentheses	Java	Medium	Backtracking, String
23	Valid Parentheses	Java	Easy	String, Hash Table
26	Remove Duplicates from Sorted Array	Java	Easy	Array, Two Pointers
28	Find the Index of the First Occurrence in a String	Java	Medium	String, String Matching
48	Rotate Image	Java	Medium	Matrix
54	Spiral Matrix	Java	Medium	Matrix
55	Jump Game	Java	Medium	Array
62	Unique Paths	Java	Medium	Dynamic Programming
64	Minimum Path Sum	Java	Medium	Dynamic Programming
67	Add Binary	Java	Easy	String
70	Climbing Stairs	Java	Easy	Dynamic Programming
71	Simplify Path	Java	Medium	Stack
73	Set Matrix Zeroes	Java	Medium	Matrix
75	Sort Colors	C	Medium	Array, Sort
79	Word Search	Java	Medium	Backtracking, Matrix
83	Remove Duplicates from Sorted List	Java	Easy	LinkedList
88	Merge Sorted Array	Java	Easy	Array
91	Decode Ways	Java	Medium	Dynamic Programming
100	Same Tree	Java	Easy	Binary Tree, Recursion
121	Best Time to Buy and Sell Stock	Java	Easy	Array
122	Best Time to Buy and Sell Stock II	Java	Medium	Array
141	Linked List Cycle	Java	Easy	LinkedList
149	Max Points on a Line	Java	Hard	Matrix, Math
151	Reverse Words in a String	Java	Medium	String
152	Maximum Product Subarray	Java	Medium	Dynamic Programming
168	Excel Sheet Column Title	Java	Easy	String
169	Majority Element	Java	Easy	HashMap
171	Excel Sheet Column Number	Java	Easy	String
202	Happy Number	Java	Easy	Two Pointers, Math
203	Remove Linked List Elements	Java	Easy	LinkedList
206	Reverse Linked List	Java	Easy	LinkedList
215	Kth Largest Element in an Array	Java	Medium	Queue
227	Basic Calculator II	Java	Medium	String
231	Power of Two	Java	Easy	Bit Manipulation
268	Missing Number	Java	Easy	Math
273	Integer to English Words	Java	Hard	String
283	Move Zeroes	Java	Easy	String
287	Find the Duplicate Number	Java	Medium	Array, Sort
290	Word Pattern	Java	Easy	HashMap
322	Coin Change	Java	Medium	Dynamic Programming
338	Counting Bits	Java	Easy	Bit Manipulation
442	Find All Duplicates in an Array	Java	Medium	Array
453	Minimum Moves to Equal Array Elements	Java	Medium	Array
560	Subarray Sum Equals K	Java	Medium	HashMap
593	Valid Square	Java	Medium	Set
628	Maximum Product of Three Numbers	Java	Easy	Math, Sorting
680	Valid Palindrome II	Java	Easy	String
876	Middle of the Linked List	Java	Easy	LinkedList
935	Knight Dialer	Python3	Medium	Dynamic Programming
974	Subarray Sums Divisible by K	Java	Medium	Array
1290	Convert Binary Number in a Linked List to Integer	Java	Easy	LinkedList
1423	Maximum Points You Can Obtain from Cards	Java	Medium	Sliding Window
1492	The kth Factor of n	Java	Medium
1519	Number of Nodes in the Sub-Tree With the Same Label	Java	Medium	Depth First Search
2194	Cells in a Range on an Excel Sheet	Java	Easy	String