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Day1:Single Number

Day2:Happy Number

Day3:Maximum Subarray

Day4:Move Zeroes

Day5:Best Time to Buy and Sell Stock ll

Day6:Group Anagrams

Day7:Counting Elements

Day8:Middle of Linked List

Day9:Backspace String Compare

Day10:Min Stack

Day11:Diameter of Binary tree

Day12:Last Stone Weight

Day13:Contiguous Array

Day14:Perform String Shift

Day15:Product of Array Except Self

Day16:Valid Parenthesis String

Day17:Number of Islands

Day18:Minimum Path Sum

Day19:Search in Rotated Sorted Array

Day20:Construct Binary Search Tree from Preorder Traversal

Day21:Leftmost Column with at Least a One

Day22:Subarray Sum Equals K

Day23:Bitwise AND of Numbers Range

Day24:LRU Cache

Day25:Jump Game

Day26:Longest Common Subsequence

Day27:Maximal Square

Day28:First Unique Number

Day29:Binary Tree Maximum Path Sum

Day30:Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree