阿木博主一句话概括:基于邻接表【1】的Scheme【2】语言图结构实现与广度优先搜索【3】算法
阿木博主为你简单介绍:
本文旨在探讨使用Scheme语言实现图结构及其广度优先搜索(BFS)算法。我们将介绍图的基本概念和邻接表表示方法。接着,我们将详细阐述如何使用Scheme语言构建图结构,并实现广度优先搜索算法。我们将通过实例验证【4】算法的正确性和效率。
一、
图是一种重要的数据结构,广泛应用于计算机科学和实际应用中。在Scheme语言中,我们可以通过邻接表来表示图,并实现各种图算法。本文将围绕这一主题展开,详细介绍如何使用Scheme语言实现图结构及其广度优先搜索算法。
二、图的基本概念
1. 图的定义:图是由顶点集合和边集合组成的无序集合。顶点集合中的元素称为顶点,边集合中的元素称为边。
2. 图的分类:根据边的性质,图可以分为无向图【5】和有向图【6】;根据顶点之间的连接关系,图可以分为连通图【7】和连通分量【8】。
3. 图的表示方法:常见的图表示方法有邻接矩阵【9】和邻接表。
三、邻接表表示图
1. 邻接表定义:邻接表是一种用链表表示图的数据结构,每个顶点对应一个链表,链表中的元素表示与该顶点相邻的顶点。
2. 邻接表实现:
scheme
(define (make-empty-adjacency-list)
(make-vector 0))
(define (add-edge adj-list src dest)
(vector-set! adj-list src (cons dest (vector-ref adj-list src))))
(define (get-adjacent-vertices adj-list vertex)
(if (vector-ref adj-list vertex)
(cdr (vector-ref adj-list vertex))
'()))
四、广度优先搜索算法
1. 算法描述:广度优先搜索是一种遍历图的方法,从起始顶点开始,按照顶点的邻接顺序依次访问顶点,直到所有顶点都被访问过。
2. 算法实现【10】:
scheme
(define (bfs adj-list start-vertex)
(let ((visited (make-vector (vector-length adj-list) f)))
(let ((queue (list start-vertex)))
(while (not (null? queue))
(let ((current-vertex (car queue)))
(set! (vector-ref visited current-vertex) t)
(display current-vertex)
(newline)
(let ((adjacent-vertices (get-adjacent-vertices adj-list current-vertex)))
(for-each
(lambda (vertex)
(if (not (vector-ref visited vertex))
(begin
(set! (vector-ref visited vertex) t)
(set! queue (cons vertex queue)))))
adjacent-vertices))
(set! queue (cdr queue)))))))
五、实例验证
```scheme
(define adj-list (make-empty-adjacency-list))
(add-edge【11】 adj-list 0 1)
(add-edge adj-list 0 2)
(add-edge adj-list 1 3)
(add-edge adj-list 1 4)
(add-edge adj-list 2 5)
(add-edge adj-list 3 6)
(add-edge adj-list 4 7)
(add-edge adj-list 5 8)
(add-edge adj-list 6 9)
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