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Algorithms

Data structures, sorting, graphs, dynamic programming

3 challenges
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Two SumEasy
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Binary Search on Rotated ArrayMedium
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LRU Cache DesignHardPro
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SQL

Window functions, CTEs, query optimization, analytics

3 challenges
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Top N Earners Per DepartmentEasy
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7-Day Rolling Revenue AverageMedium
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User Cohort Retention AnalysisHardPro
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ML Design

System design, feature engineering, model evaluation

3 challenges
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Design a Recommendation SystemEasy
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Feature Engineering for Fraud DetectionMedium
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Production ML Model MonitoringHardPro
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