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/*
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* File: graph_dfs.rs
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* Created Time: 2023-07-12
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* Author: night-cruise (2586447362@qq.com)
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*/
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mod graph_adjacency_list;
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use graph_adjacency_list::GraphAdjList;
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use graph_adjacency_list::{vals_to_vets, vets_to_vals, Vertex};
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use std::collections::HashSet;
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/* 深度優先走訪輔助函式 */
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fn dfs(graph: &GraphAdjList, visited: &mut HashSet<Vertex>, res: &mut Vec<Vertex>, vet: Vertex) {
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res.push(vet); // 記錄訪問頂點
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visited.insert(vet); // 標記該頂點已被訪問
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// 走訪該頂點的所有鄰接頂點
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if let Some(adj_vets) = graph.adj_list.get(&vet) {
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for &adj_vet in adj_vets {
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if visited.contains(&adj_vet) {
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continue; // 跳過已被訪問的頂點
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}
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// 遞迴訪問鄰接頂點
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dfs(graph, visited, res, adj_vet);
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}
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}
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}
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/* 深度優先走訪 */
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// 使用鄰接表來表示圖，以便獲取指定頂點的所有鄰接頂點
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fn graph_dfs(graph: GraphAdjList, start_vet: Vertex) -> Vec<Vertex> {
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// 頂點走訪序列
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let mut res = vec![];
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// 雜湊集合，用於記錄已被訪問過的頂點
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let mut visited = HashSet::new();
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dfs(&graph, &mut visited, &mut res, start_vet);
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res
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}
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/* Driver Code */
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fn main() {
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/* 初始化無向圖 */
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let v = vals_to_vets(vec![0, 1, 2, 3, 4, 5, 6]);
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let edges = vec![
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[v[0], v[1]],
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[v[0], v[3]],
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[v[1], v[2]],
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[v[2], v[5]],
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[v[4], v[5]],
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[v[5], v[6]],
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];
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let graph = GraphAdjList::new(edges);
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println!("\n初始化後，圖為");
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graph.print();
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/* 深度優先走訪 */
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let res = graph_dfs(graph, v[0]);
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println!("\n深度優先走訪（DFS）頂點序列為");
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println!("{:?}", vets_to_vals(res));
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}
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