Companies

2.Remove Brackets from an Algebraic Expression

also at 26 more

2

Medium9 co.

Medium

Strings Stack & Queues

also at 8 more

3

3.Jump Game - I

Medium29 co.

Medium

Greedy Algorithms

also at 28 more

4

4.Count Inversions

Medium6 co.

Medium

also at 5 more

5

5.Next Permutation

Medium32 co.

Medium

6.Minimum Window Substring

also at 31 more

6

Medium30 co.

Medium

8.Count subarrays with given xor K

also at 29 more

7

7.Dijkstra's algorithm

Medium10 co.

Medium

Heaps Graphs

also at 9 more

8

Medium3 co.

Medium

Arrays Bit Manipulation

also at 2 more

9

9.Task Scheduler

Medium17 co.

Medium

Heaps Greedy Algorithms

also at 16 more

10

10.Binary Tree Longest Consecutive Sequence II

Medium7 co.

Medium

12.Split array - largest sum

also at 6 more

11

11.Two sum in BST

Medium10 co.

Medium

Binary Search Trees

also at 9 more

12

Medium23 co.

Medium

Binary Search Dynamic Programming

also at 22 more

13

13.Reverse a LL

Medium30 co.

Medium

Linked List

also at 29 more

14

14.Palindrome Check

Medium28 co.

Medium

also at 27 more

15

15.Remove K Digits

Medium22 co.

Medium

16.Longest Repeating Character Replacement

also at 21 more

16

Medium22 co.

Medium

17.Check if a tree is a BST or not

also at 21 more

17

Medium18 co.

Medium

19.Morris Inorder Traversal

also at 17 more

18

18.N Queen

Hard19 co.

Hard

Recursion & Backtracking

also at 18 more

19

Hard10 co.

Hard

20.Search in rotated sorted array-I

also at 9 more

20

Medium34 co.

Medium

Binary Search

also at 33 more

21

21.Search in 2D matrix - II

Medium17 co.

Medium

Binary Search

also at 16 more

22

22.Maximum Points You Can Obtain from Cards

Medium19 co.

Medium

23.Check for symmetrical BTs

also at 18 more

23

Medium10 co.

Medium

Recursion & Backtracking Binary Trees

also at 9 more

24

24.Best Time to Buy and Sell Stock with Cooldown

Medium12 co.

Medium

Dynamic Programming

also at 11 more

25

25.Count Subarrays With Fixed Bounds

Hard5 co.

Hard

also at 4 more

26

26.Number of islands

Medium48 co.

Medium

27.Valid Paranthesis Checker

also at 47 more

27

Medium50 co.

Medium

Greedy Algorithms

also at 49 more

28

28.Binary Subarrays With Sum

Medium14 co.

Medium

Arrays Hashing

also at 13 more

29

29.Heapify Algorithm

Medium12 co.

Medium

Heaps

also at 11 more

30

30.Merge two Sorted Lists

Medium32 co.

Medium

Linked List Recursion & Backtracking

also at 31 more

31

31.Add two numbers in Linked List

Medium38 co.

Medium

Linked List

also at 37 more

32

32.Binary Tree Longest Consecutive Sequence

Medium7 co.

Medium

33.Count Substrings With K-Frequency Characters II

also at 6 more

33

Medium8 co.

Medium

also at 7 more

34

34.Majority Element-I

Medium28 co.

Medium

35.Divide two numbers without multiplication and division

also at 27 more

35

Medium7 co.

Medium

Bit Manipulation

also at 6 more

36

36.Binary Tree Vertical Order Traversal

Medium10 co.

Medium

Hashing Binary Trees

also at 9 more

37

37.Find the MST weight

Medium8 co.

Medium

38.Longest Increasing Subsequence

also at 7 more

38

Medium28 co.

Medium

Binary Search Dynamic Programming

also at 27 more

39

39.Check for Contradictions in Equations

Hard3 co.

Hard

40.Count Strictly Increasing Subarrays

also at 2 more

40

Medium7 co.

Medium

Dynamic Programming

also at 6 more

41

41.Largest rectangle in a histogram

Hard30 co.

Hard

42.Topological sort or Kahn's algorithm

also at 29 more

42

Medium9 co.

Medium

44.Top K Frequent Elements

also at 8 more

43

43.Longest Common Prefix

Medium26 co.

Medium

Tries

also at 25 more

44

Medium33 co.

Medium

Hashing Heaps

also at 32 more

45

45.Rotate matrix by 90 degrees

Medium25 co.

Medium

46.Search in rotated sorted array-II

also at 24 more

46

Medium11 co.

Medium

Binary Search

also at 10 more

47

47.Maximum Nesting Depth of the Parentheses

Medium11 co.

Medium

Strings Stack & Queues

also at 10 more

48

48.LFU Cache

Hard28 co.

Hard

Hashing Linked List

also at 27 more

49

49.Calculate the Power of a Number using Binary Exponentiation

Easy3 co.

Easy

Mathematics

also at 2 more

50

50.Longest Substring Without Repeating Characters

Medium51 co.

Medium