Topic-Wise

Array:

1. Maximum Points You Can Obtain from Cards
2. Flip Arrays
3. First Missing Integer

Tree:

1. Flatten Binary Tree to Linked List
2. Maximum Sum Path In Binary Tree
3. Binary Tree Cameras

String:

1. Intelligent substring
2. Minimum appends to make string Palindrome
3. Ambiguous Coordinates

Math:

1. Count Primes | Sieve of Eratosthenes
2. Minimum Moves to Equal Array Elements II

Recursion/ Backtracking:

1. Combination Sum
2. N Queens II

Heap:

1. Construct Target Array With Multiple Sums

Dynamic Programming: 

1. Palindrome Partitioning II
2. Rod Cutting Problem
3. Minimum Subset Sum Difference
4. Partition to K equal Sum subset
5. Tushar's Birthday (Unbounded Knapsack)
6. Maximum Sum Path In Binary Tree
7. Merge Elements
8. Tiling With Dominoes
9. Maximum Sum Without Adjacent Element
10. Range Sum Query 2D - Immutable
11. Longest String Chain

DFS (Depth first Search)

1. Max Area Of Island

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