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#![allow(dead_code)]
#[derive(Debug)]
struct Node {
val: i32,
left: Option<Box<Node>>,
right: Option<Box<Node>>,
}
impl Node {
fn new(val: i32) -> Self {
Node { val, left: None, right: None }
}
}
fn insert(root: Option<Box<Node>>, val: i32) -> Option<Box<Node>> {
match root {
None => Some(Box::new(Node::new(val))),
Some(mut node) => {
if val < node.val {
node.left = insert(node.left, val);
} else {
node.right = insert(node.right, val);
}
Some(node)
}
}
}
fn inorder(root: &Option<Box<Node>>) {
if let Some(node) = root {
inorder(&node.left);
println!("{}", node.val);
inorder(&node.right);
}
}
fn main() {
let mut root = None;
root = insert(root, 50);
root = insert(root, 30);
root = insert(root, 20);
root = insert(root, 40);
root = insert(root, 70);
root = insert(root, 60);
root = insert(root, 80);
inorder(&root);
} |