Practice · 2 of 3
Dedup: Pick the Structure
CHALLENGE
Difficulty: intermediate+25 XP
Implement Dedup preserving FIRST-occurrence order, and Common returning the sorted intersection of two sequences (no duplicates in the result).
``csharp
static List<string> Dedup(IEnumerable<string> items);
static List<int> Common(IEnumerable<int> a, IEnumerable<int> b);
``
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