QUESTIONS BY COMPANY

IBM LeetCode Questions 2026

Browse LeetCode problems frequently asked by IBM. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Two Sum	EASY	87.5%	ArrayHash Table
Longest Substring Without Repeating Characters	MEDIUM	87.5%	Hash TableStringSliding Window
Median of Two Sorted Arrays	HARD	37.5%	ArrayBinary SearchDivide and Conquer
Longest Palindromic Substring	MEDIUM	75%	Two PointersStringDynamic Programming
Palindrome Number	EASY	50%	Math
Integer to Roman	MEDIUM	87.5%	Hash TableMathString
Roman to Integer	EASY	87.5%	Hash TableMathString
Longest Common Prefix	EASY	50%	ArrayStringTrie
Letter Combinations of a Phone Number	MEDIUM	62.5%	Hash TableStringBacktracking
Valid Parentheses	EASY	75%	StringStack
Rotate Image	MEDIUM	75%	ArrayMathMatrix
Group Anagrams	MEDIUM	62.5%	ArrayHash TableStringSorting
Maximum Subarray	MEDIUM	50%	ArrayDivide and ConquerDynamic Programming
Shortest and Lexicographically Smallest Beautiful String	MEDIUM	50%	StringSliding Window
Merge Sorted Array	EASY	37.5%	ArrayTwo PointersSorting
Maximum Profitable Triplets With Increasing Prices I	MEDIUM	75%	ArrayBinary Indexed TreeSegment Tree
Best Time to Buy and Sell Stock	EASY	87.5%	ArrayDynamic Programming
Longest Consecutive Sequence	MEDIUM	50%	ArrayHash TableUnion-Find
Maximum Profitable Triplets With Increasing Prices II	HARD	75%	ArrayBinary Indexed TreeSegment Tree
LRU Cache	MEDIUM	37.5%	Hash TableLinked ListDesignDoubly-Linked List

Need Help Solving These Problems?

CodingInterviewAI can instantly identify algorithms and generate optimal solutions for any LeetCode problem. Get step-by-step explanations and ace your next technical interview.

CodingInterviewAI

Home Blog Give Feedback

Legal

Terms of Use Privacy Policy Legal Notice