Kruskal算法的C语言程序

来源:互联网 发布:基于php视频网站设计 编辑:程序博客网 时间:2024/05/16 06:23

Kruskal算法是有关图的最小生成树的算法。Kruskal算法是两个经典的最小生成树算法之一,另外一个是Prim算法

程序来源:Kruskal's Algorithm。

百度百科:Kruskal算法。

维基百科:Kruskal's Algorithm

C语言程序(去除了原文中非标准的C语言代码):

#include<stdio.h>#include<stdlib.h>int i,j,k,a,b,u,v,n,ne=1;int min,mincost=0,cost[9][9],parent[9];int find(int);int uni(int,int);int main(){    printf("\n\tImplementation of Kruskal's algorithm\n");    printf("\nEnter the no. of vertices:");    scanf("%d",&n);    printf("\nEnter the cost adjacency matrix:\n");    for(i=1;i<=n;i++)    {        for(j=1;j<=n;j++)        {            scanf("%d",&cost[i][j]);            if(cost[i][j]==0)                cost[i][j]=999;        }    }    printf("The edges of Minimum Cost Spanning Tree are\n");    while(ne < n)    {        for(i=1,min=999;i<=n;i++)        {            for(j=1;j <= n;j++)            {                if(cost[i][j] < min)                {                    min=cost[i][j];                    a=u=i;                    b=v=j;                }            }        }        u=find(u);        v=find(v);        if(uni(u,v))        {            printf("%d edge (%d,%d) =%d\n",ne++,a,b,min);            mincost +=min;        }        cost[a][b]=cost[b][a]=999;    }    printf("\n\tMinimum cost = %d\n",mincost);}int find(int i){    while(parent[i])    i=parent[i];    return i;}int uni(int i,int j){    if(i!=j)    {        parent[j]=i;        return 1;    }    return 0;}

运行结果:

Implementation of Kruskal's algorithmEnter the no. of vertices:6Enter the cost adjacency matrix:0 3 1 6 0 03 0 5 0 3 01 5 0 5 6 46 0 5 0 0 20 3 6 0 0 60 0 4 2 6 0The edges of Minimum Cost Spanning Tree are1 edge (1,3) =12 edge (4,6) =23 edge (1,2) =34 edge (2,5) =35 edge (3,6) =4Minimum cost = 13


0 0