// Create binary search tree
var tree = BinarySearchTree<Int>()

// Insert nodes into the tree
tree.insert(10)
tree.insert(20)
tree.insert(5)
tree.insert(25)
tree.insert(100)
tree.insert(0)
tree.insert(45)
tree.insert(95)

// Check if the tree contains certain elements
tree.contains(45)
tree.contains(50)
