Companies

3.Merge Two 2D Arrays by Summing Values

also at 33 more

2

2.Matrix Diagonal Sum

Easy1 co.

Easy

Matrix

also at 0 more

3

Easy1 co.

Easy

4.Continuous Subarray Sum

also at 0 more

4

Medium3 co.

Medium

also at 2 more

5

5.Text Justification

Hard12 co.

Hard

also at 11 more

6

6.Swap Nodes in Pairs

Medium7 co.

Medium

also at 6 more

7

7.Add Strings

Easy7 co.

Easy

8.Count Substrings Without Repeating Character

also at 6 more

8

Medium1 co.

Medium

10.Search X in sorted array

also at 0 more

9

9.Valid Anagram

Easy25 co.

Easy

Strings Hashing

also at 24 more

10

Easy12 co.

Easy

11.Check if LL is palindrome or not

also at 11 more

11

Medium18 co.

Medium

12.Longest Substring With At Most K Distinct Characters

also at 17 more

12

Medium15 co.

Medium

Strings Hashing

also at 14 more

13

13.Find Common Elements Between Two Arrays

Easy1 co.

Easy

Hashing

also at 0 more

14

14.Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Medium9 co.

Medium

also at 8 more

15

15.K Nearest Integers

Medium20 co.

Medium

16.Max Consecutive Ones III

also at 19 more

16

Medium20 co.

Medium

17.Longest Substring with At Least K Repeating Characters

also at 19 more

17

Medium3 co.

Medium

18.Product of Two Run-Length Encoded Arrays

also at 2 more

18

Medium2 co.

Medium

19.Find Median from Data Stream

also at 1 more

19

Medium30 co.

Medium

20.Maximum Consecutive Ones

also at 29 more

20

Easy14 co.

Easy

21.Max Consecutive Ones II

also at 13 more

21

Medium5 co.

Medium

Dynamic Programming

also at 4 more

22

22.Longest Palindromic Substring

Medium40 co.

Medium

Strings Dynamic Programming

also at 39 more

23

23.Subarrays with K Different Integers

Hard12 co.

Hard

24.Remove Nth node from the back of the LL

also at 11 more

24

Medium23 co.

Medium

26.Top K Frequent Elements

also at 22 more

25

25.Basic Calculator II

Medium14 co.

Medium

Stack & Queues

also at 13 more

26

Medium33 co.

Medium

Hashing Heaps

also at 32 more

27

27.Maximum Product of Two Elements in an Array

Easy3 co.

Easy

29.Search insert position

also at 2 more

28

28.LCA in BST

Medium7 co.

Medium

Binary Search Trees

also at 6 more

29

Easy12 co.

Easy

also at 11 more

30

30.Rotten Oranges

Medium39 co.

Medium

Arrays Graphs

also at 38 more

31

31.Search in a 2D Matrix

Medium18 co.

Medium

32.Check if a tree is a BST or not

also at 17 more

32

Medium18 co.

Medium

Binary Trees

also at 17 more

33

33.Kadane's Algorithm

Medium45 co.

Medium

34.Evaluate Reverse Polish Notation

also at 44 more

34

Medium9 co.

Medium

Stack & Queues

also at 8 more

35

35.Add Binary

Easy12 co.

Easy

Bit Manipulation

also at 11 more

36

36.Palindrome Check

Medium28 co.

Medium

37.Lowest Common Ancestor of a Binary Tree III

also at 27 more

37

Medium7 co.

Medium

Hashing Binary Trees

also at 6 more

38

38.Destination City

Easy1 co.

Easy

Hashing

also at 0 more

39

39.Add two numbers in Linked List

Medium38 co.

Medium

also at 37 more

40

40.Range Sum of BST

Easy1 co.

Easy

Binary Search Trees

also at 0 more

41

41.String Compression

Medium21 co.

Medium

45.Longest Strictly Increasing or Strictly Decreasing Subarray

also at 20 more

42

42.Two Sum

Easy58 co.

Easy

Arrays Hashing

also at 57 more

43

43.Jewels and Stones

Easy3 co.

Easy

Hashing

also at 2 more

44

44.Right/Left View of BT

Medium13 co.

Medium

Binary Trees

also at 12 more

45

Easy1 co.

Easy

46.Remove duplicates from sorted array

also at 0 more

46

Easy22 co.

Easy

also at 21 more

47

47.4 Sum

Medium25 co.

Medium

also at 24 more

48

48.Generate Parentheses

Medium32 co.

Medium

Recursion & Backtracking

also at 31 more

49

49.Reverse a LL

Medium30 co.

Medium