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use std::rc::Rc; use std::cell::RefCell; pub struct BinaryTree{ val: i64, left: Option<Rc<RefCell<BinaryTree>>>, right: Option<Rc<RefCell<BinaryTree>>> } impl BinaryTree{ pub fn new(val: i64)-> Option<Rc<RefCell<BinaryTree>>>{ return Some(Rc::new( RefCell::new( BinaryTree{ val, left: None, right: None } ) ) ) } pub fn insert_left(&mut self, left: Option<Rc<RefCell<BinaryTree>>>) { self.left = left; } pub fn insert_right(&mut self, right: Option<Rc<RefCell<BinaryTree>>>) { self.right = right; } pub fn traverse(&self){ print!("{:?}\n",self.val); match self.left.as_ref(){ Some(left) =>{ left.borrow().traverse(); }, None =>{ } } match self.right.as_ref(){ Some(right) =>{ right.borrow().traverse(); } None =>{ } } } pub fn print2DUtil(&self, mut space: i64){ space = space + 10; match self.right.as_ref(){ Some(right) => { right.borrow().print2DUtil(space); } None => { } } println!(); for i in 10..space{ print!(" ") } println!("{:?}\n", self.val); match self.left.as_ref(){ Some(left) => { left.borrow().print2DUtil(space); } None => { } } } } #[cfg(test)] mod tests { use super::*; #[test] fn it_works() { let a = BinaryTree::new(1); let b = BinaryTree::new(2); let c = BinaryTree::new(3); let d = BinaryTree::new(10); let mut a_ref = a.as_ref().unwrap().borrow_mut(); a_ref.insert_left(b.clone()); a_ref.insert_right(c.clone()); b.as_ref().unwrap().borrow_mut().insert_left(d.clone()); a_ref.traverse(); drop(a_ref); } #[test] fn test_print2DUtil(){ let a = BinaryTree::new(1); let b = BinaryTree::new(2); let c = BinaryTree::new(3); let d = BinaryTree::new(10); let mut a_ref = a.as_ref().unwrap().borrow_mut(); a_ref.insert_left(b.clone()); a_ref.insert_right(c.clone()); b.as_ref().unwrap().borrow_mut().insert_left(d.clone()); a_ref.print2DUtil(0); } }