假期的宿舍 二分图

Code:

#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std;
const int maxn=300;
const int INF=1000000+233;
int C[maxn][maxn],is[maxn],home[maxn],idx[maxn];
int s,t;
struct Edge{
	int from,to,cap;
	Edge(int u,int v,int c):from(u),to(v),cap(c){}
};
struct Dicnic{
	vector<Edge>edges;
	vector<int>G[maxn];
	queue<int>Q;
	int d[maxn],vis[maxn],current[maxn];
	void init()
	{
		edges.clear();
		for(int i=0;i<maxn;++i)G[i].clear();
		memset(d,0,sizeof(d));
	    memset(vis,0,sizeof(vis));
	    memset(current,0,sizeof(current));
	}
	void add_edge(int u,int v,int c)
	{
		edges.push_back(Edge(u,v,c));
		edges.push_back(Edge(v,u,0));
		int m=edges.size();
		G[u].push_back(m-2);
		G[v].push_back(m-1);
	}
	int BFS()
	{
		memset(vis,0,sizeof(vis));
		Q.push(s);vis[s]=1,d[s]=0;
		while(!Q.empty())
		{
			int u=Q.front();Q.pop();
			int siz=G[u].size();
			for(int i=0;i<siz;++i)
			{
				Edge r=edges[G[u][i]];
				if(!vis[r.to]&&r.cap>0)
				{
					vis[r.to]=1,d[r.to]=d[u]+1;
					Q.push(r.to);
				}
			}
		}
		if(vis[t])return 1;
		return 0;
	}
	int dfs(int x,int cur)
	{
		if(x==t)return cur;
		int f,flow=0;
		int siz=G[x].size();
		for(int i=current[x];i<siz;++i)
		{
			current[x]=i;
			int u=G[x][i];
			Edge r=edges[u];
			if(d[r.to]==d[x]+1&&r.cap>0)
			{
				f=dfs(r.to,min(cur,r.cap));
				if(f>0)
				{
					cur-=f,flow+=f;
					edges[u].cap-=f,edges[u^1].cap+=f;
				}
			}
			if(cur==0)break;
		}
		return flow;
	}
	int maxflow()
	{
		int flow=0;
		while(BFS())
		{
			memset(current,0,sizeof(current));
			flow+=dfs(s,INF);
		}
		return flow;
	}
}op;
void init()
{
	memset(is,0,sizeof(is));
	memset(home,0,sizeof(home));
	memset(C,0,sizeof(C));
}
int main()
{
	//freopen("in.txt","r",stdin);
	int T,n;
	scanf("%d",&T);
	while(T--)
	{
		op.init();
		init();
		int num=0,cc=0;
		scanf("%d",&n);
		for(int i=1;i<=n;++i)
		{
			int a;scanf("%d",&a);
			if(a)
			{
				is[i]=1,num+=1,idx[i]=num;
			}
		}
		for(int i=1;i<=n;++i)
		{
			int a;scanf("%d",&a);
			if(is[i]&&a)home[i]=1,cc+=1;
		}
		for(int i=1;i<=n;++i)
			for(int j=1;j<=n;++j)scanf("%d",&C[i][j]);
		s=0,t=188;
		for(int i=1;i<=n;++i)
		{
			if(is[i])op.add_edge(n+idx[i],t,1);
			if(!home[i])
			{
				op.add_edge(s,i,1);
				if(is[i])op.add_edge(i,idx[i]+n,1);
				for(int j=1;j<=n;++j)
				{
					if(C[i][j]&&is[j])op.add_edge(i,n+idx[j],1);
				}
			}
		}
		int ans=op.maxflow();
		if(ans==n-cc)printf("^_^\n");
		else printf("T_T\n");
	}
	return 0;
}

原文地址：https://www.cnblogs.com/guangheli/p/9934554.html