|
|
|
|
|
/*
|
|
|
|
|
|
* File: graph_bfs.rs
|
|
|
|
|
|
* Created Time: 2023-07-12
|
|
|
|
|
|
* Author: night-cruise (2586447362@qq.com)
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
mod graph_adjacency_list;
|
|
|
|
|
|
|
|
|
|
|
|
use std::collections::{HashSet, VecDeque};
|
|
|
|
|
|
use graph_adjacency_list::GraphAdjList;
|
|
|
|
|
|
use graph_adjacency_list::{Vertex, vets_to_vals, vals_to_vets};
|
|
|
|
|
|
|
|
|
|
|
|
/* 广度优先遍历 BFS */
|
|
|
|
|
|
// 使用邻接表来表示图，以便获取指定顶点的所有邻接顶点
|
|
|
|
|
|
fn graph_bfs(graph: GraphAdjList, start_vet: Vertex) -> Vec<Vertex> {
|
|
|
|
|
|
// 顶点遍历序列
|
|
|
|
|
|
let mut res = vec![];
|
|
|
|
|
|
// 哈希表，用于记录已被访问过的顶点
|
|
|
|
|
|
let mut visited = HashSet::new();
|
|
|
|
|
|
visited.insert(start_vet);
|
|
|
|
|
|
// 队列用于实现 BFS
|
|
|
|
|
|
let mut que = VecDeque::new();
|
|
|
|
|
|
que.push_back(start_vet);
|
|
|
|
|
|
// 以顶点 vet 为起点，循环直至访问完所有顶点
|
|
|
|
|
|
while !que.is_empty() {
|
|
|
|
|
|
let vet = que.pop_front().unwrap(); // 队首顶点出队
|
|
|
|
|
|
res.push(vet); // 记录访问顶点
|
|
|
|
|
|
// 遍历该顶点的所有邻接顶点
|
|
|
|
|
|
if let Some(adj_vets) = graph.adj_list.get(&vet) {
|
|
|
|
|
|
for &adj_vet in adj_vets {
|
|
|
|
|
|
if visited.contains(&adj_vet) {
|
|
|
|
|
|
continue; // 跳过已被访问过的顶点
|
|
|
|
|
|
}
|
|
|
|
|
|
que.push_back(adj_vet); // 只入队未访问的顶点
|
|
|
|
|
|
visited.insert(adj_vet); // 标记该顶点已被访问
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
// 返回顶点遍历序列
|
|
|
|
|
|
res
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Driver Code */
|
|
|
|
|
|
fn main() {
|
|
|
|
|
|
/* 初始化无向图 */
|
|
|
|
|
|
let v = vals_to_vets(vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
|
|
|
|
|
|
let edges = vec![
|
|
|
|
|
|
[v[0], v[1]],
|
|
|
|
|
|
[v[0], v[3]],
|
|
|
|
|
|
[v[1], v[2]],
|
|
|
|
|
|
[v[1], v[4]],
|
|
|
|
|
|
[v[2], v[5]],
|
|
|
|
|
|
[v[3], v[4]],
|
|
|
|
|
|
[v[3], v[6]],
|
|
|
|
|
|
[v[4], v[5]],
|
|
|
|
|
|
[v[4], v[7]],
|
|
|
|
|
|
[v[5], v[8]],
|
|
|
|
|
|
[v[6], v[7]],
|
|
|
|
|
|
[v[7], v[8]],
|
|
|
|
|
|
];
|
|
|
|
|
|
let graph = GraphAdjList::new(edges);
|
|
|
|
|
|
println!("\n初始化后，图为");
|
|
|
|
|
|
graph.print();
|
|
|
|
|
|
|
|
|
|
|
|
/* 广度优先遍历 BFS */
|
|
|
|
|
|
let res = graph_bfs(graph, v[0]);
|
|
|
|
|
|
println!("\n广度优先遍历（BFS）顶点序列为");
|
|
|
|
|
|
println!("{:?}", vets_to_vals(res));
|
|
|
|
|
|
}
|
