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C# collection choice, hashing, set operations, enumeration, LINQ execution, grouping, materialization, and performance trade-offs.
Practice items tagged with Collections and LINQ.
Aggregates log entries into per-minute error counts with deterministic output.
Chooses a sequential collection from size, mutation, access pattern, memory locality, and the behavior callers actually need.
Avoids hidden quadratic work by indexing repeated matches while preserving duplicate, missing, ordering, and memory semantics.
Separates ordinal identity comparison from culture-aware display ordering and keeps hash-based collection semantics consistent.
Chooses between sequence, counted, indexed, set, and dictionary contracts based on required operations and complexity.
Implements chunking for batch processing without dropping final partial batches.