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class Person {
    var residence: Residence?
}
 
// 定义了一个变量 rooms，它被初始化为一个Room[]类型的空数组
class Residence {
    var rooms = [Room]()
    var numberOfRooms: Int {
        return rooms.count
    }
    subscript(i: Int) -> Room {
 
 
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Snippet Metadata
Owner	w3xue
Created	2 years ago
Modified	2 years ago
Visibility	Public