Browse LeetCode problems frequently asked by Keeptruckin. 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
Maximum Product of Three Numbers
EASY
75%
ArrayMathSorting
Contiguous Array
MEDIUM
87.5%
ArrayHash TablePrefix Sum
Merge Sorted Array
EASY
75%
ArrayTwo PointersSorting
Valid Parenthesis String
MEDIUM
100%
StringDynamic ProgrammingStackGreedy
Search a 2D Matrix II
MEDIUM
75%
ArrayBinary SearchDivide and ConquerMatrix
Max Consecutive Ones III
MEDIUM
75%
ArrayBinary SearchSliding WindowPrefix Sum
Group Anagrams
MEDIUM
75%
ArrayHash TableStringSorting
Restore IP Addresses
MEDIUM
75%
StringBacktracking
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