Browse LeetCode problems frequently asked by Persistent Systems. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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1kosmos
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UST
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Walmart Labs
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Whatfix
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Winzo
Wipro
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Xing
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30 days
3 months
6 months
More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Palindrome Number
EASY
75%
Math
Minimum Bit Flips to Convert Number
EASY
100%
Bit Manipulation
Valid Parentheses
EASY
75%
StringStack
Group Anagrams
MEDIUM
87.5%
ArrayHash TableStringSorting
Valid Anagram
EASY
62.5%
Hash TableStringSorting
Maximum Subarray
MEDIUM
62.5%
ArrayDivide and ConquerDynamic Programming
Two Sum
EASY
75%
ArrayHash Table
Longest Substring Without Repeating Characters
MEDIUM
62.5%
Hash TableStringSliding Window
Longest Palindromic Substring
MEDIUM
62.5%
Two PointersStringDynamic Programming
Merge Sorted Array
EASY
62.5%
ArrayTwo PointersSorting
Longest Common Prefix
EASY
75%
ArrayStringTrie
3Sum
MEDIUM
62.5%
ArrayTwo PointersSorting
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