16 lines
414 B
C#
16 lines
414 B
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace aoc2019.lib
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{
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public static class Extensions
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{
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public static IEnumerable<IEnumerable<T>> Permute<T>(this IEnumerable<T> list)
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{
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if (list.Count() == 1) return new[] { list };
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return list.SelectMany(t => Permute(list.Where(x => !x.Equals(t))), (v, p) => p.Prepend(v));
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}
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}
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}
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