http://acm.hdu.edu.cn/showproblem.php?pid=3720

 #include <iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<stdlib.h>
#include<vector>
#include<map>
#include<string>
using namespace std;
#define INF 0x3f3f3f
map<string,int>f;
struct node
{
char s[],po[];
int v,k;
}p[];
int pa[],flag,w[][],maxz;
void dfs(int x,int a,int b,int c,int d,int sum)
{
int i,j;
if(x==&&a==&&b==&&c==&&d==)
{
for(i =; i <= ; i++)
for(j = i+ ; j <= ; j++)
sum+=w[pa[i]][pa[j]];
maxz = max(maxz,sum);
flag = ;
return ;
}
if(x>) return ;
pa[a+b+c+d+] = x;
if(p[x].k == )
{
if(d<)
dfs(x+,a,b,c,d+,sum+p[x].v);
}
else if(p[x].k==)
{
if(b<)
dfs(x+,a,b+,c,d,sum+p[x].v);
}
else if(p[x].k==)
{
if(c<)
dfs(x+,a,b,c+,d,sum+p[x].v);
}
else if(a<)
{
dfs(x+,a+,b,c,d,sum+p[x].v);
}
dfs(x+,a,b,c,d,sum);
}
int main()
{
int i,n,v;
char s1[],s2[];
while(cin>>p[].s>>p[].v>>p[].po)
{
f.clear();
f[p[].s] = ;
maxz=-INF;flag=;
memset(w,,sizeof(w));
for(i = ; i <= ;i++)
{
cin>>p[i].s>>p[i].v>>p[i].po;
}
for(i = ; i <= ; i++)
{
if(strcmp(p[i].po,"defender")==)
p[i].k = ;
else if(strcmp(p[i].po,"midfielder")==)
p[i].k = ;
else if(strcmp(p[i].po,"striker")==)
p[i].k = ;
else p[i].k = ;
f[p[i].s] = i;
}
cin>>n;
for(i = ; i <= n ; i++)
{
getchar();
cin>>s1>>s2>>v;
w[f[s1]][f[s2]] = v;
w[f[s2]][f[s1]] = v;
}
dfs(,,,,,);
if(!flag) puts("impossible");
else printf("%d\n",maxz);
}
return ;
}

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