回答編集履歴
1
汎用化
test
CHANGED
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@@ -60,3 +60,90 @@
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60
60
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逆の場合はスマートな方法がありました。
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61
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[Does C# have built-in support for parsing page-number strings? - Stack Overflow](https://stackoverflow.com/questions/40161)
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[c# - Convert range of number in string to list of integer - Stack Overflow](https://stackoverflow.com/questions/19889720)
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64
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65
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---
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66
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67
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文字列からだと汎用性がないのでintで受けるパターン（逆変換付き）
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68
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melianさんとBrian Payneさんのをまるパクリｗ
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69
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70
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```cs
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71
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using System.Diagnostics;
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72
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using System.Globalization;
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73
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+
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74
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75
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for (var i = 0; i < 10; i++)
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76
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{
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var numbers = Enumerable.Range(0, 30)
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.OrderBy(x => Guid.NewGuid())
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79
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.Take(20)
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80
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.OrderBy(x => x)
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81
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.Take(Random.Shared.Next(20))
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82
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.ToList();
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83
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var rangeString = ToRangeString(numbers);
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85
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Console.WriteLine(rangeString);
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86
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87
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var numbers2 = ParseRangeString(rangeString).ToList();
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88
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Console.WriteLine(string.Join(",", numbers2));
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Console.WriteLine();
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90
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Debug.Assert(numbers.SequenceEqual(numbers2));
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92
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}
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93
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94
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95
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string ToRangeString(IEnumerable<int> source)
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96
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{
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var r = source.Select((e, i) => (e, i))
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98
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.GroupBy(t => t.e - t.i, (k, tg) => tg.Select(t => t.e))
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99
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.Select((g, i) => $",{g.First()}{(1 < g.Count() ? $"～{g.Last()}" : "")}");
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100
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return string.Join("", r).TrimStart(',');
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}
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IEnumerable<int> ParseRangeString(string source)
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{
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if (string.IsNullOrWhiteSpace(source)) return [];
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107
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108
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return source.Split(',')
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.Select(x => x.Split('～'))
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.Select(p => new
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{
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First = int.Parse(p.First(), CultureInfo.InvariantCulture),
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Last = int.Parse(p.Last(), CultureInfo.InvariantCulture)
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})
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115
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.SelectMany(x => Enumerable.Range(x.First, x.Last - x.First + 1));
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}
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```
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```
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120
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3,5,8～10
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121
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3,5,8,9,10
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122
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123
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1,3,5～8,10～14,16～19,21
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124
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1,3,5,6,7,8,10,11,12,13,14,16,17,18,19,21
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125
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126
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2
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127
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2
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128
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129
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2～3,6～8,10～14
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130
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2,3,6,7,8,10,11,12,13,14
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131
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132
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1～2,4～5,7～10
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133
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1,2,4,5,7,8,9,10
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134
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135
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0～1,4～8,10,12,14,17
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136
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0,1,4,5,6,7,8,10,12,14,17
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137
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138
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2～6
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139
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2,3,4,5,6
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140
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141
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142
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143
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144
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0,2～8,10,15,18,20～23
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145
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0,2,3,4,5,6,7,8,10,15,18,20,21,22,23
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146
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147
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1～3,5～7,9～13,16～17,19,21～22,24,26
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148
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1,2,3,5,6,7,9,10,11,12,13,16,17,19,21,22,24,26
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149
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```
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