2分木

2分木らしきものを作った。あっているかはさておき。

import Foundation


class N  {
    static var count:Int = 0
    var identifier:Int = 0
    var v:Int = 0
    var small:N? = nil
    var big:N? = nil
    
    func add(_ n:N) {
        if self.v > n.v {
            if let small = self.small {
                small.add(n)
            } else {
                self.small = n
            }
        } else {
            if let big = self.big {
                big.add(n)
            } else {
                self.big = n
            }
        }
    }
    
    init(_ v:Int) {
        self.identifier = N.count
        N.count = N.count + 1
        self.v = v
    }
    
    func selfdesc() -> String {
        return "\(self.identifier):\(self.v)"
    }
    
    func desc() -> String {
        let small = self.small?.desc() ?? ""
        let big = self.big?.desc() ?? ""
        
        return ("(\(self.v) \(small) \(big))")
    }
    
    func idesc() -> String {
        let small = self.small?.idesc() ?? ""
        let big = self.big?.idesc() ?? ""
        
        return ("(\(self.selfdesc()) \(small) \(big))")
    }
}