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30-Day LeetCoding Challenge

My solutions to 30-Day of LeetCode Challenge.

Day 1: Single Number

Day 2: Happy Number

Day 3: Maximum Subarray

* Useful links:
    [Kadane’s Algorithm](https://medium.com/@rsinghal757/kadanes-algorithm-dynamic-programming-how-and-why-does-it-work-3fd8849ed73d)

Day 4: Move Zeroes

Day 5: Best Time to Buy and Sell Stock 2

Day 6: Group Anagrams

Day 7: Counting Elements

Day 8: Middle of the Linked List

Day 9: Backspace String Compare

Day 10: Min Stack

Day 11: Diameter of Binary Tree

Day 12: Last Stone Weight

Day 13: Contiguous Array