Browse LeetCode problems frequently asked by Attentive. 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
Parse Lisp Expression
HARD
87.5%
Hash TableStringStackRecursion
Remove All Adjacent Duplicates in String II
MEDIUM
100%
StringStack
Integer to English Words
HARD
62.5%
MathStringRecursion
Valid Palindrome II
EASY
75%
Two PointersStringGreedy
Find Pivot Index
EASY
62.5%
ArrayPrefix Sum
Find First and Last Position of Element in Sorted Array
MEDIUM
62.5%
ArrayBinary Search
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