回答編集履歴
2
追記
test
CHANGED
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@@ -143,3 +143,7 @@
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143
143
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}
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144
144
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145
145
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```
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146
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+
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147
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+
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148
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+
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149
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+
もっとイケてる書き方をご存知の方は是非教えて下さい。
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1
追記
test
CHANGED
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@@ -47,3 +47,99 @@
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47
47
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System.out.println(listOfList); // => [[0], [1], [2]]
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48
48
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49
49
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```
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50
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+
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51
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+
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52
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+
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53
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+
組んでみた
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54
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+
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55
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+
---
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56
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+
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57
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+
面白そうだったので、適宜ググりつつ書いてみました。
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58
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+
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59
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+
```Java
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60
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+
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61
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+
import java.io.IOException;
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62
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+
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63
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+
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64
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+
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65
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+
import java.nio.file.Files;
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66
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+
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67
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+
import java.nio.file.Paths;
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68
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+
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69
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+
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70
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+
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71
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+
import java.util.HashMap;
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72
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+
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73
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+
import java.util.Map;
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74
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+
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75
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+
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76
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+
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77
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+
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78
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+
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79
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+
class Main {
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80
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+
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81
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+
public static void main(String[] args) throws IOException {
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82
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+
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83
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+
Map<Integer, Map<Integer, Integer>> map = new HashMap<>();
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84
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+
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85
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+
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86
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+
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87
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+
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88
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+
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89
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+
var path = Paths.get("./data.csv");
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90
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+
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91
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+
try(var in = Files.newBufferedReader(path)) {
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92
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+
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93
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+
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94
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+
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95
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+
while(true) {
|
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96
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+
|
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97
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+
var line = in.readLine();
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98
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+
|
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99
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+
if(line == null) break;
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100
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+
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101
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+
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102
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+
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103
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+
Integer question, score;
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104
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+
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105
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{
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106
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+
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107
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var fields = line.split(",");
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108
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+
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109
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+
assert fields.length == 5: "ill-formed CSV";
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110
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+
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111
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+
|
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112
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+
|
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113
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+
question = Integer.valueOf(fields[2]);
|
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114
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+
|
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115
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+
score = Integer.valueOf(fields[4]);
|
|
116
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+
|
|
117
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+
}
|
|
118
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+
|
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119
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+
|
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120
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+
|
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121
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+
var inner = map.computeIfAbsent(
|
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122
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+
|
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123
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+
question, HashMap<Integer, Integer>::new
|
|
124
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+
|
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125
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+
);
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126
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+
|
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127
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+
inner.merge(score, 1, (v1, v2) -> v1 + v2);
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128
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+
|
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129
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+
}
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|
130
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+
|
|
131
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+
}
|
|
132
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+
|
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133
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+
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134
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+
|
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135
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+
for(var key: map.keySet()) {
|
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136
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+
|
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137
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+
System.out.printf("%d, %s\n", key, map.get(key));
|
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138
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+
|
|
139
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+
}
|
|
140
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+
|
|
141
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+
}
|
|
142
|
+
|
|
143
|
+
}
|
|
144
|
+
|
|
145
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+
```
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