hdu1224 dp spfa

 1 //Accepted    300 KB    15 ms
 2 //dp时用到了a[n+1]可是一直没把她赋值，WA了无数次
 3 //dp[i]=max(dp[j]+a[i]) j<i map[j][i]=1
 4 #include <cstdio>
 5 #include <cstring>
 6 #include <iostream>
 7 using namespace std;
 8 const int imax_n = 105;
 9 const int inf = -100000000;
10 int map[imax_n][imax_n];
11 int dp[imax_n];
12 int a[imax_n];
13 int pre[imax_n];
14 int n,m;
15 void Dp()
16 {
17     for (int i=1;i<=n+1;i++)
18     {
19         dp[i]=inf;
20     }
21     dp[1]=0;
22     for (int i=2;i<=n+1;i++)
23     {
24         for (int j=1;j<i;j++)
25         if (map[j][i]==1)
26         {
27             if (dp[i]<dp[j]+a[i])
28             dp[i]=dp[j]+a[i],pre[i]=j;
29         }
30     }
31 }
32 void output(int x)
33 {
34     if (x==1)
35     {
36         printf("1");
37         return ;
38     }
39     output(pre[x]);
40     printf("->%d",x);
41 }
42 int main()
43 {
44     int T;
45     scanf("%d",&T);
46     for (int t=1;t<=T;t++)
47     {
48         scanf("%d",&n);
49         for (int i=1;i<=n;i++)
50         scanf("%d",&a[i]);
51         a[n+1]=0;
52         scanf("%d",&m);
53         int x,y;
54         memset(map,0,sizeof(map));
55         for (int i=0;i<m;i++)
56         {
57             scanf("%d%d",&x,&y);
58             map[x][y]=1;
59         }
60         Dp();
61         if (t!=1) printf("\n");
62         printf("CASE %d#\n",t);
63         printf("points : %d\n",dp[n+1]);
64         printf("circuit : ");
65         output(pre[n+1]);
66         printf("->1\n");
67     }
68     return 0;
69 }

  1 //Accepted    440 KB    0 ms
  2 //spfa
  3 #include <cstdio>
  4 #include <cstring>
  5 #include <iostream>
  6 #include <queue>
  7 #include <string.h>
  8 using namespace std;
  9 const int imax_n = 201;
 10 const int imax_e = imax_n*imax_n;
 11 const int inf = -100000000;
 12 struct edge
 13 {
 14     int u,v,c;
 15     edge()
 16     {
 17 
 18     }
 19     edge(int u,int v,int c):u(u),v(v),c(c)
 20     {
 21 
 22     }
 23 }p[imax_e];
 24 
 25 int head[imax_n];
 26 int next[imax_e];
 27 int vis[imax_n];
 28 int total_interesting_point[imax_n];
 29 int interesting_point[imax_n];
 30 int e;
 31 int n,m;
 32 
 33 void init()
 34 {
 35     memset(head,-1,sizeof(head));
 36     memset(next,-1,sizeof(next));
 37     memset(vis,0,sizeof(vis));
 38     e=0;
 39 }
 40 void addEdge(int u,int v,int c)
 41 {
 42     p[e]=edge(u,v,c);
 43     next[e]=head[u];
 44     head[u]=e++;
 45 }
 46 void outputTrack(int x)
 47 {
 48     if (x==1)
 49     {
 50         return ;
 51     }
 52     for (int i=1;i<=n;i++)
 53     if (total_interesting_point[i]+interesting_point[x]==total_interesting_point[x])
 54     {
 55         outputTrack(i);
 56         printf("%d->",i);
 57         return ;
 58     }
 59 }
 60 queue<int > q;
 61 void Dp()
 62 {
 63     for (int i=1;i<=n+1;i++)
 64     total_interesting_point[i]=inf;
 65     total_interesting_point[1]=0;
 66     while (!q.empty()) q.pop();
 67     q.push(1);
 68     vis[1]=true;
 69     while (!q.empty())
 70     {
 71         int x=q.front();
 72         q.pop();
 73         vis[x]=false;
 74         for (int i=head[x];i!=-1;i=next[i])
 75         {
 76             int nx=p[i].v;
 77             if (x<nx && total_interesting_point[nx]<total_interesting_point[x]+interesting_point[nx])
 78             {
 79                 total_interesting_point[nx]=total_interesting_point[x]+interesting_point[nx];
 80                 if (!vis[nx])
 81                 {
 82                     q.push(nx);
 83                     vis[nx]=true;
 84                 }
 85             }
 86         }
 87     }
 88     printf("points : %d\n",total_interesting_point[n+1]);
 89     printf("circuit : ");
 90     outputTrack(n+1);
 91     printf("1\n");
 92 }
 93 int main()
 94 {
 95     int T;
 96     scanf("%d",&T);
 97     for (int t=1;t<=T;t++)
 98     {
 99         scanf("%d",&n);
100         for (int i=1;i<=n;i++)
101         scanf("%d",&interesting_point[i]);
102         interesting_point[n+1]=0;
103         init();
104         scanf("%d",&m);
105         int x,y;
106         for (int i=0;i<m;i++)
107         {
108             scanf("%d%d",&x,&y);
109             addEdge(x,y,0);
110         }
111         if (t!=1) printf("\n");
112         printf("CASE %d#\n",t);
113         Dp();
114     }
115     return 0;
116 }