Easy Level

1. Bubble Sort
2. Count numbers from 1 to n that have 4 as a a digit
3. Heap Sort
4. Largest even number possible by using one swap operation in given number
5. Minimum number of distinct elements after removing m items
6. QuickSort
7. Remove duplicates from sorted array
8. Swap Kth node from beginning with Kth node from end in a Linked List
9. Write your own atoi()
10. Count ways to reach the n’th stair
11. Dynamic Programming | Set 10 ( 0-1 Knapsack Problem)
12. Dynamic Programming | Set 14 (Maximum Sum Increasing Subsequence)
13. Find day of the week for a given date
14. Find the minimum element in a sorted and rotated array
15. Find minimum number of coins that make a given value
16. Find next greater number with same set of digits
17. Greedy Algorithms | Set 1 (Activity Selection Problem)
18. Largest subarray with equal number of 0s and 1s
19. Maximum Product Subarray
20. Print a given matrix in spiral form
21. Reverse words in a given string
22. Sort a linked list of 0s, 1s and 2s
23. Sort an array of 0s, 1s and 2s
24. Write a function to reverse a linked list

Medium Level

1. Check if a number is Bleak
2. Dynamic Programming | Set 7 (Coin Change)
3. Greedy Algorithms | Set 3 (Huffman Coding)
4. Largest Sum Contiguous Subarray

Hard Level

1. Median in a stream of integers (running integers)