Practice · 3 of 4

Group and count

CHALLENGE

Difficulty: beginner+25 XP

Implement static Dictionary<string, int> CountByFirstLetter(IEnumerable<string> words) — group words by char.ToLowerInvariant(word[0]) as key; and static Dictionary<int, int> CountByLength(IEnumerable<string> words) — group by length. Null/empty input → empty dictionaries.

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