回答編集履歴
3
追記
test
CHANGED
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@@ -53,3 +53,95 @@
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53
53
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res4: Seq[Member] = List(Member(3,180,60), Member(1,170,60), Member(2,170,55))
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54
54
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55
55
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```
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56
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+
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57
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58
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59
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---
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60
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61
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62
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63
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randomの意味役割を理解できていませんでした。そこを理解できたつもりで、追記。
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64
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65
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66
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67
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```scala
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68
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69
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...
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70
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71
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val random = Seq(1,2,3)
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72
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73
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val random_2 = Seq(2,1,3)
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74
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75
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76
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77
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def sss(members: Seq[Member], randomKey: Seq[Int]): Seq[Member] =
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78
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79
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members.sortBy{
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80
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81
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x =>
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82
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83
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randomKey.map{
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84
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85
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_ match {
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86
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87
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case 1 => x.id
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88
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89
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case 2 => 10000 - x.height
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90
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91
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case 3 => x.weight
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92
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93
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}
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94
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95
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}
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96
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97
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.map{"%04d".format(_)}
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98
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99
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.mkString(" ")
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100
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101
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}
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102
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103
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104
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105
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val aa = sss(members, random)
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106
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107
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println(s" keys: ${random}")
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108
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109
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println(s"result: ${aa}")
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110
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111
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112
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113
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val bb = sss(members, random_2)
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114
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115
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println(s" keys: ${random_2}")
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116
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117
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println(s"result: ${bb}")
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118
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119
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120
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121
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val random_3 = Seq(3,2,1)
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122
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123
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124
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125
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val cc = sss(members, random_3)
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126
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127
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println(s" keys: ${random_3}")
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128
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129
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println(s"result: ${cc}")
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130
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131
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132
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133
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134
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135
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// keys: List(1, 2, 3)
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136
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137
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// result: List(Member(1,170,60), Member(2,170,55), Member(3,180,60))
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138
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139
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// keys: List(2, 1, 3)
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140
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141
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// result: List(Member(3,180,60), Member(1,170,60), Member(2,170,55))
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142
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143
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// keys: List(3, 2, 1)
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144
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145
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// result: List(Member(2,170,55), Member(3,180,60), Member(1,170,60))
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146
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+
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147
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```
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2
追記
test
CHANGED
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@@ -23,3 +23,33 @@
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23
23
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res15: Seq[Member] = List(Member(1,170,60), Member(2,170,55), Member(3,180,60))
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24
24
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25
25
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```
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26
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27
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28
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29
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---
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30
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31
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32
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33
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むむ?
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34
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35
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36
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37
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> random_2の場合は、身長でソートし、同じの場合はidでソート、それでも同じ場合は体重でソート
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38
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39
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> // 求めたい結果
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40
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41
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> List(Member(3,180,60), Member(1,170,60), Member(2,170,55))
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42
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43
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44
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45
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「身長でソートし」ではなく、「身長を降順ソートし」かよ。
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46
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+
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47
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+
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48
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+
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49
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```scala
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50
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+
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51
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scala> members.sortBy{x => "%04d %04d %04d".format(10000-x.height, x.id, x.weight)}
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52
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+
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53
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res4: Seq[Member] = List(Member(3,180,60), Member(1,170,60), Member(2,170,55))
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54
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55
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```
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1
typo
test
CHANGED
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@@ -10,7 +10,7 @@
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10
10
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11
11
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// idでソートし、idが同じの場合は身長でソート、それでも同じ場合は、体重でソート
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12
12
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13
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-
scala> members.sortBy
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13
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+
scala> members.sortBy{x => "%04d %04d %04d".format(x.id, x.height, x.weight)}
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14
14
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15
15
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res14: Seq[Member] = List(Member(1,170,60), Member(2,170,55), Member(3,180,60))
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16
16
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@@ -18,7 +18,7 @@
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18
18
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19
19
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// 身長でソートし、同じの場合はidでソート、それでも同じ場合は体重でソート
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20
20
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21
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-
scala> members.sortBy
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21
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+
scala> members.sortBy{x => "%04d %04d %04d".format(x.height, x.id, x.weight)}
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22
22
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23
23
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res15: Seq[Member] = List(Member(1,170,60), Member(2,170,55), Member(3,180,60))
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24
24
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