Browse LeetCode problems frequently asked by Hcl. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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1kosmos
6sense
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Gameskraft
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Line
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Machine Zone
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TIAA
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UST
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Vk
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Walmart Labs
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Wayfair
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Wayve
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Wells Fargo
Weride
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Whatfix
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Winzo
Wipro
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Wix
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Worldquant
Woven By Toyota
Xing
Yahoo
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Yext
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Zluri
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Zs Associates
Zscaler
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Zynga
30 days
3 months
6 months
More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Valid Parentheses
EASY
75%
StringStack
Two Sum
EASY
100%
ArrayHash Table
Longest Substring Without Repeating Characters
MEDIUM
75%
Hash TableStringSliding Window
3Sum
MEDIUM
62.5%
ArrayTwo PointersSorting
Merge Sorted Array
EASY
75%
ArrayTwo PointersSorting
Reverse String
EASY
75%
Two PointersString
Second Highest Salary
MEDIUM
62.5%
Database
Department Top Three Salaries
HARD
62.5%
Database
Valid Palindrome
EASY
75%
Two PointersString
Longest Palindromic Substring
MEDIUM
62.5%
Two PointersStringDynamic Programming
Palindromic Substrings
MEDIUM
62.5%
Two PointersStringDynamic Programming
Reverse Words in a String
MEDIUM
62.5%
Two PointersString
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