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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
Longest Substring Without Repeating Characters
MEDIUM
62.5%
Hash TableStringSliding Window
Largest 3-Same-Digit Number in String
EASY
100%
String
Valid Parentheses
EASY
75%
StringStack
Filter Characters by Frequency
EASY
100%
Hash TableStringCounting
Longest Common Prefix
EASY
62.5%
ArrayStringTrie
Longest Palindromic Substring
MEDIUM
62.5%
Two PointersStringDynamic Programming
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