Companies

3.Check if a tree is a BST or not

also at 0 more

2

2.Merge K sorted Lists

Medium33 co.

Medium

Linked List Heaps

also at 32 more

3

Medium18 co.

Medium

4.Largest BST in Binary Tree

also at 17 more

4

Hard5 co.

Hard

Binary Search Trees

also at 4 more

5

5.Delete Tree Nodes

Medium4 co.

Medium

Arrays General & N-ary Trees

also at 3 more

6

6.Level Order Traversal

Medium13 co.

Medium

7.Distance to a Cycle in Undirected Graph

also at 12 more

7

Hard3 co.

Hard

Graphs

also at 2 more

8

8.Cheapest flight within K stops

Medium15 co.

Medium

Graphs

also at 14 more

9

9.Average Height of Buildings in Each Segment

Medium8 co.

Medium

Arrays Heaps

also at 7 more

10

10.Asteroid Collision

Medium31 co.

Medium

Arrays Stack & Queues

also at 30 more

11

11.Palindrome partitioning

Medium17 co.

Medium

12.Minimize Max Distance to Gas Station

also at 16 more

12

Medium8 co.

Medium

Binary Search

also at 7 more

13

13.Longest Consecutive Sequence in an Array

Medium37 co.

Medium

Arrays Hashing

also at 36 more

14

14.Rabin Karp Algorithm

Medium3 co.

Medium

Strings

also at 2 more

15

15.Number of Substrings Containing All Three Characters

Medium17 co.

Medium

Strings

also at 16 more

16

16.Job sequencing Problem

Medium9 co.

Medium

17.Count Substrings Without Repeating Characters

also at 8 more

17

Medium6 co.

Medium

Strings

also at 5 more

18

18.Matrix chain multiplication

Hard4 co.

Hard

21.Valid Paranthesis Checker

also at 3 more

19

19.Trapping Rainwater

Medium48 co.

Medium

Stack & Queues

also at 47 more

20

20.Implement Min Heap

Medium11 co.

Medium

Heaps

also at 10 more

21

Medium50 co.

Medium

22.Maximum Nesting Depth of the Parentheses

also at 49 more

22

Medium11 co.

Medium

Strings Stack & Queues

also at 10 more

23

23.Edit distance

Medium24 co.

Medium

24.Maximum Subtree of the Same Color

also at 23 more

24

Medium1 co.

Medium

General & N-ary Trees

also at 0 more

25

25.Maximum Width of BT

Medium12 co.

Medium

26.Clone a LL with random and next pointer

also at 11 more

26

Medium23 co.

Medium

Linked List

also at 22 more

27

27.Expression Add Operators

Hard10 co.

Hard

Recursion & Backtracking Mathematics

also at 9 more

28

28.Coin change II

Medium11 co.

Medium

29.Path with minimum effort

also at 10 more

29

Medium9 co.

Medium

Heaps Graphs

also at 8 more

30

30.House robber

Medium33 co.

Medium

31.Best Time to Buy and Sell Stock with Cooldown

also at 32 more

31

Medium12 co.

Medium

32.Check if an Array Is Consecutive

also at 11 more

32

Easy2 co.

Easy

Sorting

also at 1 more

33

33.Word Search

Medium27 co.

Medium

35.Find the intersection point of Y LL

also at 26 more

34

34.Find the MST weight

Medium8 co.

Medium

Graphs

also at 7 more

35

Medium17 co.

Medium

Linked List

also at 16 more

36

36.Optimal Account Balancing

Hard7 co.

Hard

37.Next Greater Element - 2

also at 6 more

37

Medium21 co.

Medium

Stack & Queues

also at 20 more

38

38.Jump Game - I

Medium29 co.

Medium

also at 28 more

39

39.Merge Intervals

Medium51 co.

Medium

40.Check if a Large Number is Divisible by 9

also at 50 more

40

Easy1 co.

Easy

Mathematics

also at 0 more

41

41.Kth largest element in a stream of running integers

Medium11 co.

Medium

Binary Search Trees Heaps

also at 10 more

42

42.Find Root of N-Ary Tree

Medium1 co.

Medium

General & N-ary Trees

also at 0 more

43

43.Sudoku Solver

Hard16 co.

Hard

44.Binary Tree Longest Consecutive Sequence

also at 15 more

44

Medium7 co.

Medium

45.Maximum Product Subarray in an Array

also at 6 more

45

Medium25 co.

Medium

Arrays

also at 24 more

46

46.Count Numbers with Unique Digits II

Medium2 co.

Medium

also at 1 more

47

47.Rotten Oranges

Medium39 co.

Medium

Arrays Graphs

also at 38 more

48

48.N Queen

Hard19 co.

Hard

49.Serialize and De-serialize BT

also at 18 more

49

Hard21 co.

Hard