// recursiveSearch search a key from tree recursively.
recursiveSearch search a key from tree recursively.
// recursiveSearch search a key from tree recursively .
func recursiveSearch(targetNode *Node, key int) bool {
	if targetNode == nil {
		return false
	}
	if key < targetNode.Key {
		return recursiveSearch(targetNode.Left, key)
	}
	if key > targetNode.Key {
		return recursiveSearch(targetNode.Right, key)
	}
	return true
}
func recursiveSearch ( targetNode * Node , key int ) bool { if targetNode == nil { return false } if key < targetNode . Key { return recursiveSearch ( targetNode . Left , key ) } if key > targetNode . Key { return recursiveSearch ( targetNode . Right , key ) } return true }
recursiveSearch search a key from tree recursively.
recursiveSearch search a key from tree recursively .
// targetNode == key