Companies

3.Number of Closed Islands

also at 15 more

3

Medium1 co.

Medium

4.Maximum Candies Allocated to K Children

also at 0 more

4

Medium1 co.

Medium

5.Fraction to Recurring Decimal

also at 0 more

5

Medium4 co.

Medium

Hashing

also at 3 more

6

6.Frog Jump

Hard8 co.

Hard

7.Maximum Number of Events That Can Be Attended

also at 7 more

7

Medium9 co.

Medium

Heaps

also at 8 more

8

8.Number of Visible People in a Queue

Hard8 co.

Hard

9.Serialize and De-serialize BT

also at 7 more

9

Hard21 co.

Hard

12.Minimum Cost Path with Edge Reversals

also at 20 more

10

10.Reorganize String

Medium14 co.

Medium

Heaps

also at 13 more

11

11.Largest Number

Medium9 co.

Medium

Greedy Algorithms

also at 8 more

12

Medium1 co.

Medium

13.Avoid Flood in The City

also at 0 more

13

Medium1 co.

Medium

Heaps

also at 0 more

14

14.Task Scheduler

Medium17 co.

Medium

Heaps Greedy Algorithms

also at 16 more

15

15.Island Perimeter

Easy2 co.

Easy

16.Vertical Order Traversal

also at 1 more

16

Medium12 co.

Medium

also at 11 more

17

17.Maximum path sum

Hard18 co.

Hard

also at 17 more

18

18.Decode Ways

Medium13 co.

Medium

Advanced Range Data Structures

also at 12 more

19

19.My Calendar I

Medium5 co.

Medium

also at 4 more

20

20.Maximum Employees to Be Invited to a Meeting

Hard2 co.

Hard

23.Kth Missing Positive Number

also at 1 more

21

21.Move Zeros to End

Easy31 co.

Easy

Arrays

also at 30 more

22

22.Top K Frequent Words

Medium7 co.

Medium

Tries

also at 6 more

23

Easy7 co.

Easy

also at 6 more

24

24.Validate IP Address

Medium4 co.

Medium

Strings

also at 3 more

25

25.Isomorphic Strings

Easy15 co.

Easy

Hashing

also at 14 more

26

26.Create Maximum Number

Hard3 co.

Hard

also at 2 more

27

27.Simplify Path

Medium12 co.

Medium

28.Find the Duplicate Number

also at 11 more

28

Medium16 co.

Medium

Arrays Bit Manipulation

also at 15 more

29

29.Level Order Traversal

Medium13 co.

Medium

31.Count subarrays with given sum

also at 12 more

30

30.Candy

Medium24 co.

Medium

Greedy Algorithms

also at 23 more

31

Medium36 co.

Medium

Arrays Hashing

also at 35 more

32

32.Find the smallest divisor

Medium9 co.

Medium

34.Palindromic Substrings

also at 8 more

33

33.Kill Process

Medium2 co.

Medium

General & N-ary Trees

also at 1 more

34

Medium8 co.

Medium

also at 7 more

35

35.Swap Nodes in Pairs

Medium7 co.

Medium

Linked List

also at 6 more

36

36.Binary Tree Cameras

Hard6 co.

Hard

also at 5 more

37

37.Reverse Integer

Medium15 co.

Medium

Mathematics

also at 14 more

38

38.Delete a node in BST

Medium10 co.

Medium

Binary Search Trees

also at 9 more

39

39.Clone Graph

Medium10 co.

Medium

40.Find Minimum Diameter After Merging Two Trees

also at 9 more

40

Hard2 co.

Hard

41.Flatten Binary Tree to Linked List

also at 1 more

41

Medium3 co.

Medium

Linked List

also at 2 more

42

42.Longest Common Prefix

Medium26 co.

Medium

Tries

also at 25 more

43

43.Longest Mountain in Array

Medium4 co.

Medium

also at 3 more

44

44.Trapping Rainwater

Medium48 co.

Medium

47.Sort Array by Increasing Frequency

also at 47 more

45

45.Jump Game - I

Medium29 co.

Medium

Greedy Algorithms

also at 28 more

46

46.Set Matrix Zeroes

Medium17 co.

Medium

Arrays Hashing

also at 16 more

47

Easy4 co.

Easy

Hashing

also at 3 more

48

48.Merge two Sorted Lists

Medium32 co.

Medium

Linked List Recursion & Backtracking

also at 31 more

49

49.Check if a tree is a BST or not

Medium18 co.

Medium

also at 17 more

50

50.Remove K Digits

Medium22 co.

Medium