ZOJ 3933 Team Formation

费用流裸题......比赛的时候少写了一句话....导致增加了很多无用的边一直在TLE

#include<cstdio>
#include<cstring>
#include<cmath>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std;

const int maxn=+;
int n;
int belong[maxn];
int cost[maxn];
int g[maxn][maxn];
char str[maxn];

const int INF=0x7FFFFFFF;
struct Edge
{
    int from,to,cap,flow,cost;
};
int N,M,K,len,s,t;
vector<Edge> edges;
vector<int> G[maxn];
int inq[maxn];
int d[maxn];
int p[maxn];
int a[maxn];
int use[maxn];
int dis[maxn][maxn];

void init()
{
    for(int i=; i<maxn; i++) G[i].clear();
    edges.clear();
}

void Addedge(int from,int to,int cap,int cost)
{
    edges.push_back((Edge)
    {
        from,to,cap,,cost
    });
    edges.push_back((Edge)
    {
        to,from,,,-cost
    });
    len=edges.size();
    G[from].push_back(len-);
    G[to].push_back(len-);
}

bool BellmanFord(int s,int t,int &flow,int &cost)
{

    for(int i=; i<maxn; i++) d[i]=INF;

    memset(inq,,sizeof(inq));
    memset(p,-,sizeof(p));

    d[s]=;
    inq[s]=;
    p[s]=;
    a[s]=INF;

    queue<int>Q;
    Q.push(s);
    while(!Q.empty())
    {
        int u=Q.front();
        Q.pop();
        inq[u]=;
        for(int i=; i<G[u].size(); i++)
        {
            Edge& e=edges[G[u][i]];
            if(e.cap>e.flow&&d[e.to]>d[u]+e.cost)
            {
                d[e.to]=d[u]+e.cost;
                p[e.to]=G[u][i];
                a[e.to]=min(a[u],e.cap-e.flow);
                if(!inq[e.to])
                {
                    Q.push(e.to);
                    inq[e.to]=;
                }
            }
        }
    }
    if(d[t]==INF) return false;
    flow+=a[t];
    cost+=d[t]*a[t];
    int u=t;
    while(u!=s)
    {
        edges[p[u]].flow+=a[t];
        edges[p[u]^].flow-=a[t];
        u=edges[p[u]].from;
    }
    return true;
}

void Mincost (int s,int t)
{
    int flow=,cost=;
    while(BellmanFord(s,t,flow,cost));
    printf("%d ",flow);
    printf("%d\n",*flow-cost);
}

void read()
{
    scanf("%s",str);
    for(int i=;str[i];i++) belong[i+]=str[i]-'';
    scanf("%s",str);
    for(int i=;str[i];i++) cost[i+]=str[i]-'';

    memset(g,,sizeof g);

    for(int i=;i<=n;i++)
    {
        int num; scanf("%d",&num);
        while(num--)
        {
            int id; scanf("%d",&id);
            g[i][id]=g[id][i]=;
        }
    }
}

int main()
{
    int T; scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n); s=,t=n+;
        init();
        read();
        for(int i=;i<=n;i++)
        {
            if(belong[i]==) Addedge(,i,,);
            else Addedge(i,n+,,);
        }

        for(int i=;i<=n;i++)
        {
            if(belong[i]==) continue;

            for(int j=;j<=n;j++)
            {
                if(i==j) continue;
                if(g[i][j]==) continue;
                if(belong[j]==) continue;
                Addedge(i,j,,cost[i]+cost[j]);
            }
        }
        Mincost(s,t);
        for(int i=;i<edges.size();i=i+)
        {
            if(edges[i].from==) continue;
            if(edges[i].to==n+) continue;
            if(edges[i].flow==) continue;
            printf("%d %d\n",edges[i].from,edges[i].to);
        }
    }
    return ;
}