poj3436网络流之最大流拆点

#include<map>
#include<set>
#include<cmath>
#include<queue>
#include<stack>
#include<vector>
#include<cstdio>
#include<cassert>
#include<iomanip>
#include<cstdlib>
#include<cstring>
#include<iostream>
#include<algorithm>
#define pi acos(-1)
#define ll long long
#define mod 10007
#define ls l,m,rt<<1
#define rs m+1,r,rt<<1|1
#pragma comment(linker, "/STACK:1024000000,1024000000")

using namespace std;

const double g=10.0,eps=1e-9;
const int N=200+5,maxn=200+5,inf=0x3fffff;

int a[N][20];
int s,t,n,p,pre[N];
bool vis[N];
int c[N][N];
bool bfs()
{
    memset(pre,0,sizeof pre);
    memset(vis,0,sizeof vis);
    vis[s]=1;
    queue<int>q;
    q.push(s);
    while(!q.empty()){
        int x=q.front();
        q.pop();
        if(x==t)return 1;
        for(int i=0;i<=2*n+1;i++)
        {
            if(!vis[i]&&c[x][i])
            {
                vis[i]=1;
                q.push(i);
                pre[i]=x;
            }
        }
    }
    return 0;
}
int max_flow()
{
    int ans=0;
    while(1){
        if(!bfs())break;
        int minn=inf;
        for(int i=t;i!=s;i=pre[i])
            minn=min(minn,c[pre[i]][i]);
        for(int i=t;i!=s;i=pre[i])
        {
            c[pre[i]][i]-=minn;
            c[i][pre[i]]+=minn;
        }
        ans+=minn;
    }
    cout<<ans<<" ";
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
 //   cout<<setiosflags(ios::fixed)<<setprecision(2);
    while(cin>>p>>n){
        memset(c,0,sizeof(c));
        for(int i=1;i<=n;i++)
        {
            cin>>c[i][i+n];
            for(int j=1;j<=p;j++)cin>>a[i][j];
            for(int j=1;j<=p;j++)cin>>a[i+n][j];
        }
        for(int i=1;i<=n;i++)
        {
            bool flag=1;
            for(int j=1;j<=p;j++)
                if(a[i][j]==1)
                {
                    flag=0;
                    break;
                }
            if(flag)c[0][i]=inf;
            flag=1;
            for(int j=1;j<=p;j++)
                if(a[i+n][j]!=1)
                {
                    flag=0;
                    break;
                }
            if(flag)c[i+n][2*n+1]=inf;
        }
        for(int i=n+1;i<=2*n;i++)//前驱
        {
            for(int j=1;j<=n;j++)//后继
            {
                bool flag=1;
                for(int l=1;l<=p;l++)
                {
                    if(a[j][l]+a[i][l]==1)
                    {
                        flag=0;
                        break;
                    }
                }
                if(flag)c[i][j]=inf;
            }
        }
    /*    for(int i=0;i<=2*n+1;i++)
        {
            for(int j=0;j<=2*n+1;j++)
                cout<<c[i][j]<<" ";
            cout<<endl;
        }*/
        s=0;t=2*n+1;//t是汇点
        max_flow();
        int cnt=0,a1[N],a2[N],a3[N];
        for(int i=1;i<=n;i++)
        {
            for(int j=1;j<=n;j++)
            {
                if(i!=j&&c[j][i+n]>0)
                {
                    ++cnt;
                    a1[cnt]=i;
                    a2[cnt]=j;
                    a3[cnt]=c[j][i+n];
                }
            }
        }
        cout<<cnt<<endl;
        for(int i=1;i<=cnt;i++)
            cout<<a1[i]<<" "<<a2[i]<<" "<<a3[i]<<endl;
    }
    return 0;
}