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Affirm LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Shortest Uncommon Substring in an Array	MEDIUM	87.5%	ArrayHash TableStringTrie
Group Anagrams	MEDIUM	75%	ArrayHash TableStringSorting
Design Hit Counter	MEDIUM	62.5%	ArrayBinary SearchDesignQueueData Stream
Insert Delete GetRandom O(1)	MEDIUM	100%	ArrayHash TableMathDesignRandomized
Insert Delete GetRandom O(1) - Duplicates allowed	HARD	75%	ArrayHash TableMathDesignRandomized
String Compression III	MEDIUM	50%	String
String Compression	MEDIUM	62.5%	Two PointersString
Parse Lisp Expression	HARD	75%	Hash TableStringStackRecursion
Valid Anagram	EASY	62.5%	Hash TableStringSorting
Coin Change	MEDIUM	50%	ArrayDynamic ProgrammingBreadth-First Search
Number of Recent Calls	EASY	50%	DesignQueueData Stream
Optimal Account Balancing	HARD	50%	ArrayDynamic ProgrammingBacktrackingBit ManipulationBitmask

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