hdu 2853 Assignment 费用流

#include <stdio.h>
#include <iostream>
#include <string.h>
using namespace std;
const int N=400;
const int MAXE=20000000;
const int inf=1<<30;
int head[N],s,t,cnt,ans;
int d[N],pre[N];
bool vis[N];
int q[MAXE];
int map[200][200],fee[200][200];
struct Edge
{
    int u,v,c,w,next;
}edge[MAXE];

void addedge(int u,int v,int w,int c)
{
    edge[cnt].u=u;
    edge[cnt].v=v;
    edge[cnt].w=w;
    edge[cnt].c=c;
    edge[cnt].next=head[u];
    head[u]=cnt++;
    edge[cnt].v=u;
    edge[cnt].u=v;
    edge[cnt].w=-w;
    edge[cnt].c=0;
    edge[cnt].next=head[v];
    head[v]=cnt++;
}

int SPFA()
{
    int l,r;
    memset(pre,-1,sizeof(pre));
    memset(vis,0,sizeof(vis));
    for(int i=0;i<=t;i++) d[i]=inf;
    d[s]=0;
    l=0;r=0;
    q[r++]=s;
    vis[s]=1;
    while(l<r)
    {
        int u=q[l++];
        vis[u]=0;
        for(int j=head[u];j!=-1;j=edge[j].next)
        {
            int v=edge[j].v;
            if(edge[j].c>0&&d[u]+edge[j].w<d[v])
            {
                d[v]=d[u]+edge[j].w;
                pre[v]=j;
                if(!vis[v])
                {
                    vis[v]=1;
                    q[r++]=v;
                }
            }
        }
    }
    if(d[t]==inf)
        return 0;
    return 1;
}

void MCMF()
{
    int flow=0;
    while(SPFA())
    {
        int u=t;
        int mini=inf;
        while(u!=s)
        {
            if(edge[pre[u]].c<mini)
                mini=edge[pre[u]].c;
                u=edge[pre[u]].u;
        }
        flow+=mini;
        u=t;
        ans+=d[t]*mini;
        while(u!=s)
        {
            edge[pre[u]].c-=mini;
            edge[pre[u]^1].c+=mini;
            u=edge[pre[u]].u;
        }
    }
}

int main()
{
    int nn,mm;
    while(scanf("%d%d",&nn,&mm)!=EOF)
    {
        int i,j,u;
        cnt=0;
        s=0;t=nn+mm+1;
        for(i=0;i<=t;i++)
            head[i]=-1;
        memset(map,0,sizeof(map));
        for(i=1;i<=nn;i++)
            for(j=1;j<=mm;j++)
                scanf("%d",&fee[i][j]);
        int init=0;
        for(i=1;i<=nn;i++)
        {
            scanf("%d",&u);
            map[i][u]=1;
            init+=fee[i][u];
            addedge(s,i,0,1);
        }
        for(i=1;i<=mm;i++) addedge(i+nn,t,0,1);
        for(i=1;i<=nn;i++)
            for(j=1;j<=mm;j++)
            {
                if(map[i][j])
                    addedge(i,j+nn,-fee[i][j]*51-1,1);
                else addedge(i,j+nn,-fee[i][j]*51,1);
            }
        ans=0;
        MCMF();
        printf("%d %d\n",nn+ans%51,(-ans/51)-init);
    }
    return 0;
}