Browse LeetCode problems frequently asked by Mastercard. 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
Valid Parentheses
EASY
100%
StringStack
Two Sum
EASY
100%
ArrayHash Table
Valid Anagram
EASY
75%
Hash TableStringSorting
Container With Most Water
MEDIUM
75%
ArrayTwo PointersGreedy
Longest Palindromic Substring
MEDIUM
75%
Two PointersStringDynamic Programming
Best Time to Buy and Sell Stock
EASY
87.5%
ArrayDynamic Programming
Gas Station
MEDIUM
75%
ArrayGreedy
Coin Change
MEDIUM
87.5%
ArrayDynamic ProgrammingBreadth-First Search
Word Search
MEDIUM
75%
ArrayStringBacktrackingDepth-First SearchMatrix
Fizz Buzz
EASY
87.5%
MathStringSimulation
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