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42 lines
1.3 KiB
42 lines
1.3 KiB
2 years ago
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/**
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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 std::collections::VecDeque;
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use std::{cell::RefCell, rc::Rc};
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use tree_node::{vec_to_tree, TreeNode};
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include!("../include/include.rs");
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fn level_order(root: &Rc<RefCell<TreeNode>>) -> Vec<i32> {
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// 初始化队列，加入根结点
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let mut que = VecDeque::new();
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que.push_back(Rc::clone(&root));
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// 初始化一个列表，用于保存遍历序列
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let mut vec = Vec::new();
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while let Some(node) = que.pop_front() { // 队列出队
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vec.push(node.borrow().val); // 保存结点值
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if let Some(left) = node.borrow().left.as_ref() {
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que.push_back(Rc::clone(left)); // 左子结点入队
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}
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if let Some(right) = node.borrow().right.as_ref() {
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que.push_back(Rc::clone(right)); // 右子结点入队
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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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/* 初始化二叉树 */
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// 这里借助了一个从数组直接生成二叉树的函数
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let root = vec_to_tree(op_vec![1, 2, 3, 4, 5, 6, 7]).unwrap();
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println!("初始化二叉树\n");
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print_util::print_tree(&root);
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/* 层序遍历 */
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let vec = level_order(&root);
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print!("\n层序遍历的结点打印序列 = {:?}", vec);
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}
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