http://poj.org/problem?id=2387 import java.util.*; public class Main{ public static void main(String args[]){ Scanner in=new Scanner(System.in); int c=0; int t=in.nextInt();//����˳�����WA��N�Σ������������⣡ int n=in.nextInt(); int dist[]=new int[n+1];//��������ȷ�������С������RE��N�Σ� int[][] w=new int[n+1][n+1]; for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ w[i][j]=Integer.MAX_VALUE; } } for(int i=0;i< t;i++){//����}�㼰֮����� int sn=in.nextInt(); int en=in.nextInt(); c=in.nextInt(); if(c< w[sn][en]) w[sn][en]=w[en][sn]=c; } dijkstra(n,w,dist); System.out.println(dist[1]); } public static void dijkstra(int v ,int[][] a, int[] dist){//���·��dijkstra�㷨 int nn = dist.length - 1 ; boolean[] s = new boolean[nn+1]; //��ʼ�� for(int i = 1; i <= nn; i++) dist[i] = a[v][i]; dist[v] = 0; s[v] = true; for(int i = 1; i < nn; i++){ int temp =Integer.MAX_VALUE; int u = v; for(int j = 1; j < nn; j++){ if(!s[j] && dist[j] < temp&&dist[j]>0){ u = j; temp = dist[j]; } } s[u] = true; //�ҵ��˵�һ����S�Ľڵ� for(int j = 1; j <= nn; j++) if(!s[j] &&dist[u]+a[u][j]< dist[j]&& a[u][j] < Integer.MAX_VALUE) dist[j] =dist[u]+a[u][j]; } } }
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