Heaps & Hashing Problems

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Arrays Strings 2D Arrays Searching & Sorting Backtracking Linked List Stacks & Queues Greedy Binary Trees Binary Search Trees Heaps & Hashing Graphs Tries DP Bit Manipulation Segment Trees

1

Choose k array elements such that difference of maximum and minimum is minimized

Medium

2

Heap Sort

Medium

3

Top K Frequent Elements

Medium

4

k largest elements in an array

Medium

5

Next Greater Element

Medium

6

K’th Smallest/Largest Element in Unsorted Array

Medium

7

Find the maximum repeating number in O(n) time and O(1) extra space

Medium

8

K-th smallest element after removing some integers from natural numbers

Medium

9

Find k closest elements to a given value

Medium

10

K’th largest element in a stream

Medium

11

Connect Ropes

Medium

12

Cuckoo Hashing

Medium

13

Itinerary from a List of Tickets

Medium

14

Largest Subarray with 0 Sum

Medium

15

Count distinct elements in every window of size k

Medium

16

Group Shifted Strings

Medium

17

Merge K Sorted lists

Hard

18

Find Median from Data Stream

Hard

19

Sliding Window Maximum

Hard

20

Find the smallest positive number

Hard

21

Find Surpasser Count of each element in array

Hard

22

Tournament Tree and Binary Heap

Hard

23

Check for palindrome

Hard

24

Length of the largest subarray with contiguous elements

Hard

25

Palindrome Substring Queries

Hard

26

Subarray distinct elements

Hard

27

Find the recurring function

Hard

28

K maximum sum combinations from two arrays

Hard