回答編集履歴
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修正
answer
CHANGED
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@@ -2,7 +2,7 @@
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2
2
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3
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```swift
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4
4
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extension Array {
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5
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-
mutating func
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5
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+
mutating func arraySwapIndex(index1 index1: Int, index2: Int) {
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6
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swap(&self[index1], &self[index2])
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7
7
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}
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8
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}
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