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Zopsmart LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Zigzag Conversion	MEDIUM	100%	String
Reverse Nodes in Even Length Groups	MEDIUM	75%	Linked List
Trapping Rain Water	HARD	87.5%	ArrayTwo PointersDynamic ProgrammingStackMonotonic Stack
Group Anagrams	MEDIUM	50%	ArrayHash TableStringSorting
Minimum Window Substring	HARD	75%	Hash TableStringSliding Window
Fraction Addition and Subtraction	MEDIUM	62.5%	MathStringSimulation
3Sum	MEDIUM	50%	ArrayTwo PointersSorting
Container With Most Water	MEDIUM	62.5%	ArrayTwo PointersGreedy
Remove K Digits	MEDIUM	62.5%	StringStackGreedyMonotonic Stack
Bulls and Cows	MEDIUM	62.5%	Hash TableStringCounting
Add Two Numbers	MEDIUM	50%	Linked ListMathRecursion
Letter Combinations of a Phone Number	MEDIUM	50%	Hash TableStringBacktracking
Reverse Words in a String	MEDIUM	62.5%	Two PointersString
Reverse Linked List	EASY	50%	Linked ListRecursion
Reverse Nodes in k-Group	HARD	50%	Linked ListRecursion
Longest Palindromic Substring	MEDIUM	50%	Two PointersStringDynamic Programming
Hexadecimal and Hexatrigesimal Conversion	EASY	75%	MathString
Valid Anagram	EASY	50%	Hash TableStringSorting
Broken Calculator	MEDIUM	62.5%	MathGreedy
Decode String	MEDIUM	62.5%	StringStackRecursion

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