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45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
/*
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* File: binary_tree_bfs.rs
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* Created Time: 2023-04-07
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* Author: xBLACKICEx (xBLACKICE@outlook.com)
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*/
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use hello_algo_rust::include::{print_util, vec_to_tree, TreeNode};
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use hello_algo_rust::op_vec;
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use std::collections::VecDeque;
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use std::{cell::RefCell, rc::Rc};
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/* 層序走訪 */
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fn level_order(root: &Rc<RefCell<TreeNode>>) -> Vec<i32> {
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// 初始化佇列，加入根節點
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let mut que = VecDeque::new();
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que.push_back(root.clone());
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// 初始化一個串列，用於儲存走訪序列
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let mut vec = Vec::new();
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while let Some(node) = que.pop_front() {
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// 隊列出隊
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vec.push(node.borrow().val); // 儲存節點值
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if let Some(left) = node.borrow().left.as_ref() {
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que.push_back(left.clone()); // 左子節點入列
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}
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if let Some(right) = node.borrow().right.as_ref() {
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que.push_back(right.clone()); // 右子節點入列
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};
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}
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vec
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}
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/* Driver Code */
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fn main() {
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/* 初始化二元樹 */
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// 這裡藉助了一個從陣列直接生成二元樹的函式
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let root = vec_to_tree(op_vec![1, 2, 3, 4, 5, 6, 7]).unwrap();
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println!("初始化二元樹\n");
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print_util::print_tree(&root);
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/* 層序走訪 */
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let vec = level_order(&root);
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print!("\n層序走訪的節點列印序列 = {:?}", vec);
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}
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