回答編集履歴
2
追記
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@@ -9,4 +9,16 @@
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9
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```swift
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typealias Activity = (location: CLLocation, timestamp: Date) //型を作る
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let activities: [Activity] //上で作った型の配列を作る
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-
```
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```
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N番目の配列を消去するなら
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15
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16
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```swift
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activities.enumerated().filter{$0.offset != n}
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```
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並び替えは
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21
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```swift
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22
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activities.sort(by: {$0.timestamp < $1.timestamp})
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23
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```
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24
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かな。
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1
追記
answer
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File without changes
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