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Infosys LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Two Sum	EASY	100%	ArrayHash Table
Add Two Numbers	MEDIUM	50%	Linked ListMathRecursion
Longest Substring Without Repeating Characters	MEDIUM	87.5%	Hash TableStringSliding Window
Longest Palindromic Substring	MEDIUM	75%	Two PointersStringDynamic Programming
Reverse Integer	MEDIUM	50%	Math
Palindrome Number	EASY	87.5%	Math
Container With Most Water	MEDIUM	50%	ArrayTwo PointersGreedy
Integer to Roman	MEDIUM	37.5%	Hash TableMathString
Longest Common Prefix	EASY	62.5%	ArrayStringTrie
3Sum	MEDIUM	62.5%	ArrayTwo PointersSorting
Valid Parentheses	EASY	75%	StringStack
Merge Two Sorted Lists	EASY	50%	Linked ListRecursion
Reverse Nodes in k-Group	HARD	50%	Linked ListRecursion
Remove Duplicates from Sorted Array	EASY	62.5%	ArrayTwo Pointers
Largest Number After Mutating Substring	MEDIUM	75%	ArrayStringGreedy
Next Permutation	MEDIUM	75%	ArrayTwo Pointers
Combination Sum	MEDIUM	37.5%	ArrayBacktracking
Trapping Rain Water	HARD	62.5%	ArrayTwo PointersDynamic ProgrammingStackMonotonic Stack
Group Anagrams	MEDIUM	62.5%	ArrayHash TableStringSorting
Maximum Subarray	MEDIUM	75%	ArrayDivide and ConquerDynamic Programming

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