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Strings & Collections - C# Practical Coding Problems | Aporeon

C# Practical Coding Problems

Strings & Collections

Word counts, unique characters, grouping, dedupe, and interval-style collection problems.

5 drillsPractice one at a timeOrdered pathCoding problem

Recommended start

Word Frequency

Implements a word-frequency counter with normalization, punctuation handling, and stable ordering.

Easy~15 minStep 1 of 5

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1Word FrequencyRecommended startImplements a word-frequency counter with normalization, punctuation handling, and stable ordering.Coding problemEasy~15 min.NETC#Practice 2First Unique Character

Practice order

5 drillsOne at a time

1Word FrequencyUp next / Easy / ~15 min
2First Unique CharacterEasy / ~15 min
3Group OrdersMedium / ~25 min
4

Implements a stable first-unique-character search using counts and original order.

Coding problemEasy~15 min.NETC#

Practice

3Group OrdersBuilds customer summaries from order rows using grouping, aggregation, and deterministic ordering.Coding problemMedium~25 min.NETC#Practice

4Dedupe EventsImplements duplicate suppression while preserving the first event for each idempotency key.Coding problemMedium~25 min.NETC#Practice

5Merge Time RangesImplements interval merging for scheduling-style time ranges with sorted output.Coding problemMedium~25 min.NETC#Practice

Dedupe Events

Medium / ~25 min

5Merge Time RangesMedium / ~25 min