binary_tree.swift

import Foundation

public class Node {
    var value: Int
    var left: Node?
    var right: Node?
    
    public init(_ value: Int) {
        self.value = value
    }
}

var node_1 = Node(5)
var node_2 = Node(2)
var node_3 = Node(7)
var node_4 = Node(1)
var node_5 = Node(3)
var node_6 = Node(10)

node_1.left = node_2
node_1.right = node_3
node_2.left = node_4
node_2.right = node_5
node_3.right = node_6