洛谷 P1359 租用游艇

题目传送门

2019.8.7Mr^Simon蒟蒻水题T2

解题思路:

最短路裸题

AC代码:

 1 #include<cstdio>
 2 #include<iostream>
 3 #include<cstring> 
 4 
 5 using namespace std;
 6 
 7 int n,a[201][201],dist[201];
 8 bool p[201];
 9 
10 void Dijkstra() {
11     memset(dist,0x3f,sizeof(dist));
12     memset(p,false,sizeof(p));
13     dist[1] = 0;
14     for(int i = 1;i <= n;i++)
15         dist[i] = a[1][i];
16     for(int i = 2;i <= n; i++) {
17         int bh,_min = 0x7f7f7f7f;
18         for(int j = 1;j <= n; j++) {
19             if(!p[j] && _min > dist[j]) {
20                 bh = j;
21                 _min = dist[j];
22             }
23         }
24         p[bh] = true;
25         for(int j = 1;j <= n; j++)
26             dist[j] = min(dist[j],dist[bh] + a[bh][j]);
27     }
28 }
29 
30 int main()
31 {
32     memset(a,0x3f,sizeof(a));
33     scanf("%d",&n);
34     for(int i = 1;i <= n; i++) a[i][i] = 0;
35     for(int i = 1;i <= n - 1; i++) 
36         for(int j = i + 1;j <= n; j++) 
37             scanf("%d",&a[i][j]);
38     Dijkstra();
39     printf("%d",dist[n]);
40     return 0;
41 }

 

posted @ 2019-08-07 17:45  Mr^Simon  阅读(167)  评论(0)  编辑  收藏  举报