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72 lines
2.0 KiB
72 lines
2.0 KiB
/*
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* File: binary_tree_dfs.rs
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* Created Time: 2023-04-06
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* Author: xBLACKICEx (xBLACKICE@outlook.com)
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*/
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include!("../include/include.rs");
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use std::cell::RefCell;
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use std::rc::Rc;
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use tree_node::{vec_to_tree, TreeNode};
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/* 前序走訪 */
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fn pre_order(root: Option<&Rc<RefCell<TreeNode>>>) -> Vec<i32> {
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let mut result = vec![];
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if let Some(node) = root {
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// 訪問優先順序：根節點 -> 左子樹 -> 右子樹
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result.push(node.borrow().val);
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result.extend(pre_order(node.borrow().left.as_ref()));
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result.extend(pre_order(node.borrow().right.as_ref()));
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}
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result
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}
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/* 中序走訪 */
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fn in_order(root: Option<&Rc<RefCell<TreeNode>>>) -> Vec<i32> {
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let mut result = vec![];
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if let Some(node) = root {
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// 訪問優先順序：左子樹 -> 根節點 -> 右子樹
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result.extend(in_order(node.borrow().left.as_ref()));
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result.push(node.borrow().val);
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result.extend(in_order(node.borrow().right.as_ref()));
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}
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result
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}
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/* 後序走訪 */
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fn post_order(root: Option<&Rc<RefCell<TreeNode>>>) -> Vec<i32> {
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let mut result = vec![];
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if let Some(node) = root {
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// 訪問優先順序：左子樹 -> 右子樹 -> 根節點
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result.extend(post_order(node.borrow().left.as_ref()));
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result.extend(post_order(node.borrow().right.as_ref()));
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result.push(node.borrow().val);
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}
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result
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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]);
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println!("初始化二元樹\n");
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print_util::print_tree(root.as_ref().unwrap());
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/* 前序走訪 */
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let vec = pre_order(root.as_ref());
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println!("\n前序走訪的節點列印序列 = {:?}", vec);
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/* 中序走訪 */
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let vec = in_order(root.as_ref());
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println!("\n中序走訪的節點列印序列 = {:?}", vec);
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/* 後序走訪 */
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let vec = post_order(root.as_ref());
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print!("\n後序走訪的節點列印序列 = {:?}", vec);
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}
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