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* Add Ruby and Kotlin icons Add the avatar of @curtishd * Update README * Synchronize zh-hant and zh versions. * Translate the pythontutor blocks to traditional Chinese * Fix en/mkdocs.yml * Update the landing page of the en version. * Fix the Dockerfile * Refine the en landingpage * Fix en landing page * Reset the README.md
94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
/*
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* File: tree_node.rs
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* Created Time: 2023-02-27
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* Author: xBLACKICEx (xBLACKICE@outlook.com), night-cruise (2586447362@qq.com)
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*/
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use std::cell::RefCell;
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use std::rc::Rc;
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/* 二元樹節點型別 */
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#[derive(Debug)]
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pub struct TreeNode {
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pub val: i32,
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pub height: i32,
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pub parent: Option<Rc<RefCell<TreeNode>>>,
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pub left: Option<Rc<RefCell<TreeNode>>>,
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pub right: Option<Rc<RefCell<TreeNode>>>,
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}
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impl TreeNode {
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/* 建構子 */
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pub fn new(val: i32) -> Rc<RefCell<Self>> {
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Rc::new(RefCell::new(Self {
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val,
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height: 0,
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parent: None,
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left: None,
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right: None,
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}))
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}
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}
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#[macro_export]
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macro_rules! op_vec {
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( $( $x:expr ),* ) => {
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vec![
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$( Option::from($x).map(|x| x) ),*
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]
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};
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}
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// 序列化編碼規則請參考：
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// https://www.hello-algo.com/chapter_tree/array_representation_of_tree/
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// 二元樹的陣列表示：
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// [1, 2, 3, 4, None, 6, 7, 8, 9, None, None, 12, None, None, 15]
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// 二元樹的鏈結串列表示：
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// /——— 15
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// /——— 7
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// /——— 3
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// | \——— 6
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// | \——— 12
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// ——— 1
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// \——— 2
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// | /——— 9
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// \——— 4
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// \——— 8
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/* 將串列反序列化為二元樹：遞迴 */
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fn vec_to_tree_dfs(arr: &[Option<i32>], i: usize) -> Option<Rc<RefCell<TreeNode>>> {
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if i >= arr.len() || arr[i].is_none() {
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return None;
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}
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let root = TreeNode::new(arr[i].unwrap());
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root.borrow_mut().left = vec_to_tree_dfs(arr, 2 * i + 1);
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root.borrow_mut().right = vec_to_tree_dfs(arr, 2 * i + 2);
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Some(root)
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}
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/* 將串列反序列化為二元樹 */
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pub fn vec_to_tree(arr: Vec<Option<i32>>) -> Option<Rc<RefCell<TreeNode>>> {
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vec_to_tree_dfs(&arr, 0)
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}
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/* 將二元樹序列化為串列：遞迴 */
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fn tree_to_vec_dfs(root: Option<Rc<RefCell<TreeNode>>>, i: usize, res: &mut Vec<Option<i32>>) {
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if root.is_none() {
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return;
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}
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let root = root.unwrap();
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// i + 1 is the minimum valid size to access index i
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while res.len() < i + 1 {
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res.push(None);
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}
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res[i] = Some(root.borrow().val);
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tree_to_vec_dfs(root.borrow().left.clone(), 2 * i + 1, res);
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tree_to_vec_dfs(root.borrow().right.clone(), 2 * i + 2, res);
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}
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/* 將二元樹序列化為串列 */
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pub fn tree_to_vec(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<Option<i32>> {
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let mut res = vec![];
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tree_to_vec_dfs(root, 0, &mut res);
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res
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}
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