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Pocket Gems LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Find the Index of the First Occurrence in a String	EASY	100%	Two PointersStringString Matching
Sort Colors	MEDIUM	100%	ArrayTwo PointersSorting
Non-negative Integers without Consecutive Ones	HARD	100%	Dynamic Programming
Clone Graph	MEDIUM	100%	Hash TableDepth-First SearchBreadth-First SearchGraph Theory
Word Break	MEDIUM	100%	ArrayHash TableStringDynamic ProgrammingTrieMemoization
Top K Frequent Words	MEDIUM	100%	ArrayHash TableStringTrieSortingHeap (Priority Queue)Bucket SortCounting
Shortest Palindrome	HARD	100%	StringRolling HashString MatchingHash Function
Kth Largest Element in an Array	MEDIUM	100%	ArrayDivide and ConquerSortingHeap (Priority Queue)Quickselect
Alien Dictionary	HARD	100%	ArrayStringDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort
Basic Calculator III	HARD	100%	MathStringStackRecursion
Inorder Successor in BST	MEDIUM	100%	TreeDepth-First SearchBinary Search TreeBinary Tree
Top K Frequent Elements	MEDIUM	100%	ArrayHash TableDivide and ConquerSortingHeap (Priority Queue)Bucket SortCountingQuickselect
Insert Delete GetRandom O(1)	MEDIUM	100%	ArrayHash TableMathDesignRandomized
Longest Repeating Character Replacement	MEDIUM	100%	Hash TableStringSliding Window
Find All Duplicates in an Array	MEDIUM	100%	ArrayHash TableSorting

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