class Tree<T: Comparable> {
    let root: T
    var left: Tree?
    var right: Tree?

    init(root: T) {
        self.root = root
    }

    func search(value: T) -> Tree? {
        guard value != root else { return self }
        return value < root ? left?.search(value: value) : right?.search(value: value)
    }

    func insert(value: T) {
        guard value != root else { return }
        if value < root {
            left?.insert(value: value)
            if left == nil {
                left = Tree(root: value)
            }
        } else {
            right?.insert(value: value)
            if right == nil {
                right = Tree(root: value)
            }
        }
    }
}