最小生成树之克鲁斯卡尔算法

public class Kruskal {
    public static void main(String[] args) {
        //二维数组 分别存储边的起点 终点 和权值
        int [][]edges = {{0,1,6},{0,2,1},{0,3,5},{1,2,5},{1,4,3},{2,3,5},{2,4,6},{2,5,4},{3,5,2},{4,5,6}};
        int []connect = {0,1,2,3,4,5};//辅助数组 用来存储两个顶点是否连通 初始都不连通
        quick_sort(edges,0,edges.length-1);//对边进行排序

        for(int i=0;i<edges.length;i++){
            int v1 = edges[i][0]; //边的起点
            int v2 = edges[i][1]; //边的终点
            int vc1 = connect[v1]; //起点的连通状态
            int vc2 = connect[v2]; //终点的连通状态
            if(vc1 != vc2){ //如果两个点不连通 则将其加入到最小生成树 并将连通状态改为相同的状态
                System.out.println((v1+1)+"->"+(v2+1));
                for(int j=0;j<connect.length;j++){
                    if(connect[j] == vc2)
                        connect[j] = vc1;
                }
            }
        }
    }

    public static void quick_sort(int a[][],int low,int high){
        if(low < high){
            int k = sort(a,low,high);
            quick_sort(a,low,k-1);
            quick_sort(a,k+1,high);
        }
    }
    public static int sort(int a[][],int low,int high){
        int[] k = a[low];
        while(low<high){
            while(low <high  && k[2] <= a[high][2])
                high--;
            a[low] = a[high];
            while(low <high  && k[2] >= a[low][2])
                low++;
            a[high] = a[low];
        }
        a[low] = k;
        return low;
    }
}