72 lines
1.7 KiB
C#
72 lines
1.7 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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namespace BITKit
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{
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public static class MathE
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{
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public static bool Equals<T>(params T[] objs)
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{
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var a = objs.FirstOrDefault();
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foreach (var b in objs)
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{
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if (a.Equals(b))
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{
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a = b;
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continue;
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}
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else
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{
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return false;
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}
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}
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return true;
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}
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public static IEnumerable<T> Subtract<T>(IEnumerable<T> a, IEnumerable<T> b) where T : IEnumerable
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{
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List<T> list = new();
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foreach (var x in a)
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{
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if (b.Contains(x))
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{
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}
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else
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{
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list.Add(x);
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}
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}
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return list;
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}
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public static bool Contains<T>(IEnumerable<T> a, IEnumerable<T> b)
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{
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foreach (var x in b)
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{
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if (a.Contains(x))
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{
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}
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else
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{
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return false;
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}
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}
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return true;
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}
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public static IEnumerable<T[]> Combinations<T>(IEnumerable<T> source)
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{
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if (null == source) throw new ArgumentNullException(nameof(source));
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T[] data = source.ToArray();
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return Enumerable.Range(0, 1 << (data.Length) - 1)
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.Select(index => data.Where((v, i) => (index & (1 << i)) != 0).ToArray());
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}
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}
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}
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