Browse LeetCode problems frequently asked by Optum. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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30 days
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More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Reverse Prefix of Word
EASY
100%
Two PointersStringStack
Bank Account Summary
MEDIUM
100%
Database
Longest Common Subsequence
MEDIUM
75%
StringDynamic Programming
Maximum Subarray
MEDIUM
62.5%
ArrayDivide and ConquerDynamic Programming
Two Sum
EASY
62.5%
ArrayHash Table
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