zoj2788最小割

　　这个建图比较好建，门在i房间里通向j ，i->j= INF ,j->i=1

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <climits>
#include <string>
#include <iostream>
#include <map>
#include <cstdlib>
#include <list>
#include <set>
#include <queue>
#include <stack>
using namespace std;
int e1;int s;
const int INF=0xfffffff;
int Min(int a,int b)
{
    return a>b?b:a;
}
const int maxn=111;
int m;
int len;int head[maxn];
struct edge
{
    int val;int to;int next;int op;
}e[1111111];
int level[maxn];
void add(int from,int to,int  val)
{
    e[len].to=to;e[len].val=val;
    e[len].next=head[from];
    e[len].op=len+1;
    head[from]=len++;
    e[len].to=from;e[len].val=0;
    e[len].next=head[to];
    e[len].op=len-1;
    head[to]=len++;
}

bool bfs()
{
    memset(level,0,sizeof(level));
    queue<int> q;
    q.push(s) ; level[s]=1;
    while(!q.empty()){
        int cur=q.front(); q.pop();
        for(int i=head[cur];i!=-1;i=e[i].next){
            if(e[i].val==0) continue;
            int cc=e[i].to;
            if(!level[cc]){
                q.push(cc);
                level[cc]=level[cur]+1;
            }
        }
    }
    return level[e1];
}

int dfs(int x,int val)
{
    int sum=0;
    if(x==e1) return val;
    for(int i=head[x];val&&i!=-1;i=e[i].next){
        if(!e[i].val) continue;
        int cc=e[i].to;
        if(level[cc]==level[x]+1){
            int t=dfs(cc,Min(val,e[i].val));
            e[i].val-=t;e[e[i].op].val+=t;
            sum+=t;val-=t;
        }
    }
    if(sum==0) level[x]=-1;
    return sum;
}

int dinic()
{
    int ans=0;
    int t;
    while(bfs()){
        while(t=dfs(s,INF)) ans+=t;
    }
    return ans;
}
void solve()
{
    int ans=dinic();
    if(ans>=INF) printf("PANIC ROOM BREACH\n");
    else printf("%d\n",ans);
}
int main()
{
    int Icase;
    int n;
    int c,t;char str[100];
    scanf("%d",&Icase);
    while(Icase--){
        memset(head,-1,sizeof(head));
        scanf("%d%d",&m,&n);
        s=m,e1=n;
        for(int i=0;i<m;i++){
            scanf("%s",str);scanf("%d",&c);
            if(strcmp(str,"I")==0){
                add(s,i,INF);
                for(int j=0;j<c;j++){
                    scanf("%d",&t);
                    add(i,t,INF);
                    add(t,i,1);
                }
            }
            else{
                for(int j=0;j<c;j++){
                    scanf("%d",&t);
                    add(i,t,INF);
                    add(t,i,1);
                }
            }
        }
        solve();
    }
    return 0;
}

 

。 如果这个房间有坏蛋，设源点m ，  m->i=INF.