uva10604 Chemical Reaction（DP）

题目链接：http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=1545

#include <iostream>
#include <cstring>
#include <cstdio>
#include <vector>
#include <queue>
#define ll long long
using namespace std;
int change[12][12];
ll w[12][12],dp[11][11][11][11][11][11];
bool vis[12];
int a[12];
vector<int> v;
int t,n,m;
void read(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
       for(int j=1;j<=n;j++){
          scanf("%d%lld",&change[i][j],&w[i][j]);
       }
    }
    v.clear();
    for(int i=0;i<=8;i++) v.push_back(0);
    scanf("%d",&m);
    for(int i=1;i<=m;i++){
       scanf("%d",&a[i]);
       v[a[i]]++;
    }
    char str;
    cin>>str;
}
ll DP(){
    if(v[1]+v[2]+v[3]+v[4]+v[5]+v[6]==1) return 0;
    if(dp[v[1]][v[2]][v[3]][v[4]][v[5]][v[6]]!=-1) return dp[v[1]][v[2]][v[3]][v[4]][v[5]][v[6]];
    ll ret=1e17;
    for(int i=1;i<=6;i++){
       if(v[i]==0) continue;
       for(int j=1;j<=6;j++){
           v[i]--;
           if(v[j]==0) {v[i]++;continue;}
           v[j]--;
           v[change[i][j]]++;
           //cout<<i<<" "<<j<<" "<<change[i][j]<<endl;
           ret=min(ret,DP()+w[i][j]);
           v[i]++;
           v[j]++;
           v[change[i][j]]--;
       }
    }
    return dp[v[1]][v[2]][v[3]][v[4]][v[5]][v[6]]=ret;
}
void gao(){
    memset(dp,-1,sizeof dp);
    printf("%lld
",DP());
}
int main(){
    //freopen("10604","r",stdin);
    scanf("%d",&t);
    for(int ca=1;ca<=t;ca++){
        read();
        gao();
    }
    return 0;
}