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omochimetaru 9/27/2018 1:44 AM
https://developer.apple.com/documentation/swift/bidirectionalcollection/2994840-lastindex
1:44 AM
Complexity: O(n), where n is the length of the collection.
1:44 AM
ほんとだ、なんでｗ
1:44 AM
あ
1:44 AM
あ〜・・・