30-Day-LeetCoding-Challenge

My solutions to the 30-Day LeetCoding Challenge

Week 1

Day 1

Single Number

Solution

Day 2

Happy Number

Solution

Day 3

Maximum Subarray

Solution

Day 4

Move Zeroes

Solution

Day 5

Best Time to Buy and Sell Stock II

Solution

Day 6

Group Anagrams

Solution

Day 7

Counting Elements

Solution

Week 2

Day 8

Middle of the Linked List

Solution

Day 9

Backspace String Compare

Solution

Day 10

Min Stack

Solution

Day 11

Diameter of Binary Tree

Solution

Day 12

Last Stone Weight

Solution

Day 13

Contigous Array

Solution

Day 14

Perform String Shifts

Solution

Week 3

Day 15

Product of Array Except Self

Solution

Day 16

Valid Parenthesis String

Solution

Day 17

Number of Islands

Solution

Day 18

Minimum Path Sum

Solution

Day 19

Search in Rotated Sorted Array

Solution

Day 20

Construct Binary Search Tree from Preorder Traversal

Solution

Day 21

Leftmost Column with at Least a One

Solution

Week 4

Day 22

Subarray Sum Equals K

Solution

Day 23

Bitwise AND of Numbers Range

Solution

Day 24

LRU Cache

Solution

Day 25

Jump Game

Solution

Day 26

Longest Common Subsequence

Solution

Day 27

Maximal Square

Solution

Day 28

First Unique Number

Solution

Week 5

Day 29

Binary Tree Maximum Path Sum

Solution

Day 30

Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

Solution