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fujieda/Permutation.cs

Created February 11, 2019 07:49
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Permutation.cs
// https://fujieda.mit-license.org/
static IEnumerable<IEnumerable<T>> Permutation<T>(T[] items)
{
return items.Length == 1
? new[] {items}
: items.SelectMany(item =>
Permutation(items.Where(x => !x.Equals(item)).ToArray())
.Select(perms => new[] {item}.Concat(perms)));
}
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