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C#
public static int stringConstruction(string s)
{
var sarray = s.ToCharArray().ToHashSet();
var sarrayb = s.ToCharArray().ToHashSet();
sarray.IntersectWith(sarrayb);
return sarray.Count;
}
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String Construction
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C# public static int stringConstruction(string s) { var sarray = s.ToCharArray().ToHashSet(); var sarrayb = s.ToCharArray().ToHashSet();
sarray.IntersectWith(sarrayb); return sarray.Count; }