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TCS LeetCode Questions 2026

Browse LeetCode problems frequently asked by TCS. 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
Add Two Numbers	MEDIUM	50%	Linked ListMathRecursion
Longest Substring Without Repeating Characters	MEDIUM	50%	Hash TableStringSliding Window
Longest Palindromic Substring	MEDIUM	75%	Two PointersStringDynamic Programming
Reverse Integer	MEDIUM	50%	Math
Palindrome Number	EASY	75%	Math
Container With Most Water	MEDIUM	50%	ArrayTwo PointersGreedy
Roman to Integer	EASY	50%	Hash TableMathString
Longest Common Prefix	EASY	62.5%	ArrayStringTrie
3Sum Closest	MEDIUM	37.5%	ArrayTwo PointersSorting
4Sum	MEDIUM	50%	ArrayTwo PointersSorting
3Sum	MEDIUM	62.5%	ArrayTwo PointersSorting
Merge Two Sorted Lists	EASY	25%	Linked ListRecursion
Generate Parentheses	MEDIUM	37.5%	StringDynamic ProgrammingBacktracking
Remove Duplicates from Sorted Array	EASY	50%	ArrayTwo Pointers
Find the Index of the First Occurrence in a String	EASY	62.5%	Two PointersStringString Matching
Valid Parentheses	EASY	62.5%	StringStack
Next Permutation	MEDIUM	37.5%	ArrayTwo Pointers
Find First and Last Position of Element in Sorted Array	MEDIUM	37.5%	ArrayBinary Search
Combination Sum	MEDIUM	25%	ArrayBacktracking

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