zoukankan      html  css  js  c++  java
  • 最短路径问题—Dijkstra算法

    算法:

    import java.util.*;
     
     
    public class Main6 {
             public static int N = 1050;
             public static final int INF = 0x3f3f3f3f;
             public static int [][]cost =new int[N][N];
             public static int dis[]=new int[N];
             public static boolean vis[]=new boolean[N];
             public static int n,m,s,t;
             public static int u,v,w;
         
         public static void djc(int s){
             for(int i=1;i<=n;i++){
                 dis[i]=INF;
                 vis[i]=false;
             }
             dis[s]=0;
             vis[s]=true;
             for(int i=2;i<=n;i++){
                 int Min = INF;
                 for(int j=1;j<=n;j++){
                     if(!vis[j]&&dis[j]<Min)
                         Min= dis[j];
                 }
             }
             vis[s]=true;
             for(int j=1;j<=n;j++){
                 if(!vis[j]&&dis[s]+cost[s][j]<dis[j])
                     dis[j]=dis[s]+cost[s][j];
             }
         }
         
         
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            while(sc.hasNext()){
                n = sc.nextInt();
                m = sc.nextInt();
                s = sc.nextInt();
                t = sc.nextInt();
                if(n==0&&m==0)
                    System.exit(0);
                for(int i=0;i<N;i++){
                    for(int j=0;j<N;j++)
                        cost[i][j]=INF;
                }
                for(int i=0;i<m;i++){
                    u = sc.nextInt();
                    v = sc.nextInt();
                    w = sc.nextInt();
                    cost[u][v]=cost[v][u]=w;
                }
                djc(s);
                System.out.println(dis[t]);
            }
    }
    }
  • 相关阅读:
    Winform 积累
    mvc部署iis遇到的问题总结
    开始我的BLOG生活
    sql 总结
    ajax:AutoCompleteExtender版本问题
    ancms即将上线
    ancms v2.3语言介绍
    asp.net的cms 核心代码篇
    div+css布局
    js词法结构
  • 原文地址:https://www.cnblogs.com/ls-pankong/p/10583946.html
Copyright © 2011-2022 走看看