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IBM interview questions (all time) · FAANGrind

IBM

ProductGlobal All time

IBM provides hybrid cloud, AI (watsonx), consulting, mainframes and enterprise software including Red Hat.

Est. 1911 100,001+ employees

Problems: 175
Window: All time
Topics: 6

175 problems

TopicsLinks

1

1.Letter Combinations of a Phone Number

Medium34 co.

Medium

Recursion & Backtracking

also at 33 more

2

2.Check if Array Is Sorted and Rotated

Easy7 co.

Easy

also at 6 more

3

3.Remove All Occurrences of a Substring

Medium5 co.

Medium

also at 4 more

4

4.Product of Array Except Self

Medium19 co.

Medium

also at 18 more

5

5.Missing Number

Easy8 co.

Easy

Bit Manipulation

also at 7 more

6

Easy17 co.

Easy

also at 16 more

7

7.Find the smallest divisor

Medium9 co.

Medium

also at 8 more

8

8.Palindromic Substrings

Medium8 co.

Medium

Dynamic Programming

also at 7 more

9

9.Reverse Words in a String

Medium14 co.

Medium

also at 13 more

10

10.Sort Characters by Frequency

Medium15 co.

Medium

Strings Hashing+1

also at 14 more

11

Easy12 co.

Easy

Bit Manipulation

also at 11 more

12

Hard19 co.

Hard

Recursion & Backtracking

also at 18 more

13

13.Asteroid Collision

Medium31 co.

Medium

Arrays Stack & Queues

also at 30 more

14

14.Valid Mountain Array

Easy3 co.

Easy

also at 2 more

15

15.Maximum Profitable Triplets With Increasing Prices I

Medium2 co.

Medium

Advanced Range Data Structures

also at 1 more

16

16.Number of 1 Bits

Easy5 co.

Easy

Bit Manipulation

also at 4 more

17

17.Valid Anagram

Easy25 co.

Easy

Strings Hashing

also at 24 more

18

Easy9 co.

Easy

also at 8 more

19

19.Minimum insertions to make string palindrome

Medium7 co.

Medium

Dynamic Programming

also at 6 more

20

20.Make Lexicographically Smallest Array by Swapping Elements

Medium3 co.

Medium

also at 2 more

21

21.Roman to Integer

Easy23 co.

Easy

also at 22 more

22

22.Implement Min Stack

Medium27 co.

Medium

also at 26 more

23

23.Move Zeros to End

Easy31 co.

Easy

also at 30 more

24

Medium24 co.

Medium

also at 23 more

25

25.Count Vowel Strings in Ranges

Medium1 co.

Medium

also at 0 more

26

26.Minimum Changes To Make Alternating Binary String

Easy2 co.

Easy

also at 1 more

27

27.Odd String Difference

Easy2 co.

Easy

also at 1 more

28

Easy11 co.

Easy

also at 10 more

29

29.Combinations

Medium4 co.

Medium

Recursion & Backtracking

also at 3 more

30

30.Median of 2 sorted arrays

Hard34 co.

Hard

also at 33 more

31

31.Height Checker

Easy1 co.

Easy

also at 0 more

32

32.Generate Parentheses

Medium32 co.

Medium

Recursion & Backtracking

also at 31 more

33

33.Count Ways to Group Overlapping Ranges

Medium2 co.

Medium

also at 1 more

34

34.Intersection of two sorted arrays

Medium9 co.

Medium

also at 8 more

35

35.Edit distance

Medium24 co.

Medium

Dynamic Programming

also at 23 more

36

36.Get Equal Substrings Within Budget

Medium1 co.

Medium

also at 0 more

37

37.Water Bottles

Easy3 co.

Easy

also at 2 more

38

38.String Compression

Medium21 co.

Medium

also at 20 more

39

39.Koko eating bananas

Medium33 co.

Medium

also at 32 more

40

40.Optimal Partition of String

Medium2 co.

Medium

Greedy Algorithms

also at 1 more

41

41.Maximum Consecutive Ones

Easy14 co.

Easy

also at 13 more

42

42.Count Number of Teams

Medium1 co.

Medium

Advanced Range Data Structures

also at 0 more

43

43.Last Stone Weight

Easy6 co.

Easy

also at 5 more

44

44.Find All Possible Stable Binary Arrays II

Hard1 co.

Hard

Dynamic Programming

also at 0 more

45

45.Minimum Length of String After Operations

Medium1 co.

Medium

also at 0 more

46

46.Flipping an Image

Easy2 co.

Easy

Bit Manipulation

also at 1 more

47

47.Longest Consecutive Sequence in an Array

Medium37 co.

Medium

also at 36 more

48

48.Simplify Path

Medium12 co.

Medium

also at 11 more

49

49.Trapping Rainwater

Medium48 co.

Medium

also at 47 more

50

50.Contains Duplicate

Easy15 co.

Easy

also at 14 more

…

Showing 1–50 of 175

Difficulty split

Easy46(26%)
Medium117(67%)
Hard12(7%)

Top topics

Arrays34
Greedy Algorithms19
Dynamic Programming15
Binary Search14
Stack & Queues14
Hashing13