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Aporeon

Technical interview practice, from one developer to another.

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C# Practical Coding Problems

Data Shaping & LINQ

Top-K, trees, paging, query filters, and DTO-shaped collection transformations.

4 drillsPractice one at a timeOrdered pathCoding problem

Recommended start

Top K Frequent

Implements top-K frequency selection with deterministic tie-breaking.

Medium~25 minStep 1 of 4

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1Top K FrequentRecommended startImplements top-K frequency selection with deterministic tie-breaking.Coding problemMedium~25 min.NETC#Practice 2Flatten Tree PathsFlattens a tree into display paths while preserving order and preventing simple cycles.Coding problemMedium~25 min.NETC#Practice 3Paged Result HelperImplements a safe in-memory paging helper with metadata and boundary handling.Coding problemEasy~15 min.NETC#Practice 4Parse FiltersParses a simple filter expression into a validated dictionary without accepting arbitrary keys.Coding problemMedium~25 min.NETC#Practice

Practice order

4 drillsOne at a time

1Top K FrequentUp next / Medium / ~25 min
2Flatten Tree PathsMedium / ~25 min
3Paged Result HelperEasy / ~15 min
4Parse FiltersMedium / ~25 min