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Twitter LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Regular Expression Matching	HARD	100%	StringDynamic ProgrammingRecursion
Integer to Roman	MEDIUM	100%	Hash TableMathString
Valid Parentheses	EASY	100%	StringStack
Merge k Sorted Lists	HARD	100%	Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
Trapping Rain Water	HARD	100%	ArrayTwo PointersDynamic ProgrammingStackMonotonic Stack
Multiply Strings	MEDIUM	100%	MathStringSimulation
Wildcard Matching	HARD	100%	StringDynamic ProgrammingGreedyRecursion
Merge Intervals	MEDIUM	100%	ArraySorting
Permutation Sequence	HARD	100%	MathRecursion
Pascal's Triangle	EASY	100%	ArrayDynamic Programming
Word Break II	HARD	100%	ArrayHash TableStringDynamic ProgrammingBacktrackingTrieMemoization
LRU Cache	MEDIUM	100%	Hash TableLinked ListDesignDoubly-Linked List
Time Needed to Buy Tickets	EASY	100%	ArrayQueueSimulation
Max Points on a Line	HARD	100%	ArrayHash TableMathGeometry
One Edit Distance	MEDIUM	100%	Two PointersString
Happy Number	EASY	100%	Hash TableMathTwo Pointers
Reverse Linked List	EASY	100%	Linked ListRecursion
Implement Trie (Prefix Tree)	MEDIUM	100%	Hash TableStringDesignTrie
The Skyline Problem	HARD	100%	ArrayDivide and ConquerBinary Indexed TreeSegment TreeSweep LineSortingHeap (Priority Queue)Ordered Set
Lowest Common Ancestor of a Binary Search Tree	MEDIUM	100%	TreeDepth-First SearchBinary Search TreeBinary Tree

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