回答編集履歴
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Set
answer
CHANGED
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@@ -2,4 +2,20 @@
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2
2
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if identifiers[identifier] == nil {
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3
3
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//処理
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4
4
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}
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5
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-
```
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5
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```
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6
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+
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7
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##### Setを使う
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8
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+
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9
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```swift
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10
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var identifiers = [String:Set<String>]()
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11
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12
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func addIdentifiers(identifier: String, coordinatesCount: String) {
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13
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if var coordinates = identifiers[identifier] {
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14
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//keyあり
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15
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coordinates.insert(coordinatesCount)
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16
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} else {
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17
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//keyなし
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18
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identifiers[identifier] = [coordinatesCount]
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19
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}
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20
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}
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21
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```
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