Practice · 1 of 3
Frequency Map + First Unique
CHALLENGE
Difficulty: intermediate+25 XP
Implement both: Frequency maps each whitespace-separated word to its count; FirstUnique returns the first word whose count is exactly 1 (null when none).
``csharp
static IReadOnlyDictionary<string, int> Frequency(string text);
static string? FirstUnique(string text);
``
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