vijos p1523 贪吃的九头龙（未完成）

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<algorithm>
 4 using namespace std;
 5 int point[303],next[603],v[603],c[603],cnt=0,N,M,K,f[303][303][2];
 6 bool p[303];
 7 void insect(int x,int y,int z){next[cnt]=point[x];point[x]=cnt;v[cnt]=y;c[cnt]=z;cnt++;}
 8 void dfs(int x)
 9 {
10     int i,j;
11     for (i=point[x];i!=-1;i=next[i])
12     {
13         if (l[x]==0) l[x]=v[i],p[v[i]]=1; else
14         {
15             j=l[x];
16             while (r[j]!=0) j=r[j];
17             r[j]=v[i]; p[v[i]]=1;
18         }
19     }
20     i=l[x];
21     while (i!=0) dfs(i),i=r[i];
22 }
23 void 
24 int main()
25 {
26     memset(point,-1,sizeof(point));
27     memset(next,-1,sizeof(next));
28     memset(v,0,sizeof(v));
29     memset(c,0,sizeof(c));
30     memset(p,0,sizeof(p));
31     scanf("%d %d %d\n",&N,&M,&K);
32     if (K+M-1>N) {printf("-1\n");return 0;}
33     int i,a,b,c;
34     for (i=1;i<N;++i)
35     {
36         scanf("%d %d %d\n",&a,&b,&c);
37         insect(a,b,c);insect(b,a,c);
38     }p[1]=1; dfs(1);
39     printf("%d\n",dp(1,K,1));
40 }