- Day 1 - Arranging Coins - Problem 441
- Day 2 - Binary Tree Level Order Traversal II - Problem 107
- Day 3 - Prison Cells After N Days - Problem 957
- Day 4 - Ugly Number II - Problem 264
- Day 5 - Hamming Distance - Problem 461
- Day 6 - Plus One - Problem 66
- Day 7 - Island Perimeter - Problem 463
- Day 1 - 3Sum - Problem 15
- Day 2 - Maximum Width of Binary Tree - Problem 662
- Day 3 - Flatten a Multilevel Doubly Linked List - Problem 430
- Day 4 - Subsets - Problem 78
- Day 5 - Reverse Bits - Problem 190
- Day 6 - Same Tree - Problem 100
- Day 7 - Angle Between Hands of a Clock - Problem 1344
- Day 1 - Reverse Words in a String - Problem 151
- Day 2 - Pow(x,n) - Problem 50
- Day 3 - Top K Frequent Elements - Problem 347
- Day 4 - Course Schedule II - Problem 210
- Day 5 - Add Binary - Problem 67
- Day 6 - Remove Linked List Elements - Problem 203
- Day 7 - Word Search - Problem 79
- Day 1 - Binary Tree Zigzag Level Order Traversal - Problem 103
- Day 2 - Single Number III - Problem 260
- Day 3 - All Paths From Source to Target - Problem 797
- Day 4 - Find Minimum in Rotated Sorted Array II - Problem 154
- Day 5 - Add Digits - Problem 258
- Day 6 - Construct Binary Tree from Inorder and Postorder Traversal - Problem 106
- Day 7 - Task Scheduler - Problem 621
- Day 1 - Best Time to Buy and Sell Stock with Cooldown - Problem 309
- Day 2 - Word Break II - Problem 140
- Day 3 - Climbing Stairs - Problem 70