hdu-2544-最短路(dijkstra算法模板)

 题目链接

题意很清晰，入门级题目，适合各种模板，可用dijkstra, floyd, Bellman-ford, spfa

Dijkstra链接

Floyd链接

Bellman-Ford链接

SPFA链接

 1 /*
 2     Name:HDU-2544-最短路
 3     Copyright:
 4     Author:
 5     Date: 2018/4/17 10:34:47
 6     Description:
 7     dijkstra模板 
 8 */
 9 #include <cstring>
10 #include <cstdio>
11 #include <iostream>
12 using namespace std; 
13 const int MAXN = 105;
14 const int INF = 0x3f3f3f3f;
15 int dis[MAXN], g[MAXN][MAXN], N, M;
16 bool v[MAXN];
17 void dijkstra() {
18     for (int i=1; i<=N; i++) {
19         dis[i] = INF;
20     }
21     dis[1] = 0;
22     memset(v, 0, sizeof(v));
23     for (int i=1; i<=N; ++i)  {
24         int mark=-1, mindis=INF;
25         for (int j=1; j<=N; j++) {
26             if (!v[j] &&dis[j] <mindis) {
27                 mindis = dis[j];
28                 mark = j;
29             }
30         }
31         v[mark] = 1;
32         for (int j=1; j<=N; j++) {
33             if (!v[j]) {
34                 dis[j] = min(dis[j], dis[mark] + g[mark][j]);
35             }
36         }
37     }
38 }
39 int main()
40 {
41 //    freopen("in.txt", "r", stdin);
42     while (~scanf("%d %d", &N, &M) && (N+M)) {
43         memset(g, 0x3f, sizeof(g));
44         for (int i=0; i<M; i++) {
45             int a, b, c;
46             scanf("%d %d %d", &a, &b, &c);
47             if (g[a][b] > c) {
48                 g[a][b] = g[b][a] = c;
49             }
50         }
51         dijkstra();
52         cout<<dis[N]<<endl;
53     }
54     return 0;
55 }

 

posted @ 2018-04-17 16:39  朤尧  阅读(346)  评论(0)  编辑  收藏  举报