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pub mod bst;
pub mod btree;
pub mod rbtree;
pub trait SedgewickMap<K: Ord, V> {
fn new() -> Self;
fn size(&self) -> usize;
fn get(&self, key: &K) -> Option<&V>;
fn put(&mut self, key: K, value: V);
fn height(&self) -> Option<usize>;
fn is_empty(&self) -> bool {
self.size().eq(&0_usize)
}
fn contains(&self, key: &K) -> bool {
self.get(&key).is_some()
}
fn min(&self) -> Option<&K>;
fn max(&self) -> Option<&K>;
}
pub trait TreeTraversal<K: Ord, V>: SedgewickMap<K, V> {
fn traverse(&self, traverse: &Traversals) -> std::vec::IntoIter<(&K, &V)> {
let mut vec = Vec::with_capacity(self.size());
match traverse {
Traversals::PreOrder => self.pre_order(&mut vec),
Traversals::InOrder => self.in_order(&mut vec),
Traversals::PostOrder => self.post_order(&mut vec),
Traversals::LevelOrder => {
for level in 0..=self.height().unwrap() {
self.level_order(&mut vec, level);
}
}
}
vec.into_iter()
}
fn pre_order<'a>(&'a self, vec: &mut Vec<(&'a K, &'a V)>);
fn in_order<'a>(&'a self, vec: &mut Vec<(&'a K, &'a V)>);
fn post_order<'a>(&'a self, vec: &mut Vec<(&'a K, &'a V)>);
fn level_order<'a>(&'a self, vec: &mut Vec<(&'a K, &'a V)>, level: usize);
}
pub enum Traversals {
PreOrder,
InOrder,
PostOrder,
LevelOrder,
}
#[cfg(test)]
mod tests {
use crate::bst::BST;
use crate::btree::BalancedTree;
use crate::rbtree::RedBlackTree;
use crate::SedgewickMap;
#[test]
fn its_42() {
assert_eq!(20 + 22, 42);
}
fn is_empty<K: Ord, V>(map: &impl SedgewickMap<K, V>) -> bool {
map.is_empty()
}
#[test]
fn test_empty() {
let bst: BST<i32, i32> = BST::new();
let rbt: RedBlackTree<i32, i32> = RedBlackTree::new();
let btree: BalancedTree<i32, i32> = BalancedTree::new();
assert_eq!(is_empty(&bst), true);
assert_eq!(is_empty(&rbt), true);
assert_eq!(is_empty(&btree), true);
}
}