Browse LeetCode problems frequently asked by Tripadvisor. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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30 days
3 months
6 months
More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Find Common Characters
EASY
100%
ArrayHash TableString
LRU Cache
MEDIUM
75%
Hash TableLinked ListDesignDoubly-Linked List
Valid Parentheses
EASY
100%
StringStack
Ransom Note
EASY
75%
Hash TableStringCounting
Search a 2D Matrix II
MEDIUM
62.5%
ArrayBinary SearchDivide and ConquerMatrix
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