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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#426401#6329. Colorful GraphKevin5307RE 0ms0kbC++232.0kb2024-05-31 10:09:202024-05-31 10:09:20

Judging History

你现在查看的是最新测评结果

  • [2024-05-31 10:09:20]
  • 评测
  • 测评结果:RE
  • 用时:0ms
  • 内存:0kb
  • [2024-05-31 10:09:20]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define pb emplace_back
int n,m;
vector<int> G[7007],rG[7007],nG[7007];
int vis[7007],scc[7007],tot;
vector<int> ord;
void dfs1(int u)
{
	vis[u]=1;
	for(auto v:G[u])
		if(!vis[v])
			dfs1(v);
	ord.pb(u);
}
void dfs2(int u,int c)
{
	scc[u]=c;
	for(auto v:rG[u])
		if(!scc[v])
			dfs2(v,c);
}
bitset<7007> E[7007];
void dfs(int u,int frm)
{
	E[frm][u]=1;
	for(auto v:nG[u])
		if(!E[frm][v])
			dfs(v,frm);
}
int Match[7007],MatchR[7007];
bitset<7007> flag;
int lst[7007];
int match(int x)
{
	queue<int> q;
	flag=0;
	memset(lst,-1,sizeof(lst));
	q.push(x);
	while(!q.empty())
	{
		int u=q.front();
		q.pop();
		bitset<7007> tmp=(E[u]&flag)^E[u];
		flag|=E[u];
		for(int p=tmp._Find_first();p!=tmp.size();p=tmp._Find_next(p))
		{
			if(!Match[p])
			{
				Match[p]=x;
				while(u!=x)
				{
					int v=MatchR[x];
					MatchR[x]=p;
					p=v;
					x=lst[p];
					Match[p]=x;
				}
				MatchR[x]=p;
				return 1;
			}
			lst[p]=u;
			q.push(Match[p]);
		}
	}
	return 0;
}
int fa[7007],ind[7007];
inline int anc(int x)
{
	while(fa[x]!=x) x=fa[x]=fa[fa[x]];
	return x;
}
int main()
{
	freopen("color.in","r",stdin);
	freopen("color.out","w",stdout);
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>m;
	for(int i=1;i<=m;i++)
	{
		int u,v;
		cin>>u>>v;
		G[u].pb(v);
		rG[v].pb(u);
	}
	for(int i=1;i<=n;i++)
		if(!vis[i])
			dfs1(i);
	reverse(ord.begin(),ord.end());
	for(auto x:ord)
		if(!scc[x])
			dfs2(x,++tot);
	for(int i=1;i<=n;i++)
		for(auto j:G[i])
			if(scc[i]!=scc[j])
				nG[scc[i]].pb(scc[j]);
	for(int i=1;i<=tot;i++)
		dfs(i,i);
	for(int i=1;i<=tot;i++)
		E[i][i]=0;
	int val=0;
	for(int i=1;i<=tot;i++)
		val+=match(i);
	for(int i=1;i<=tot;i++)
		fa[i]=i;
	for(int i=1;i<=tot;i++)
		if(MatchR[i])
			fa[anc(i)]=anc(MatchR[i]);
	int cnt=0;
	for(int i=1;i<=tot;i++)
		if(fa[i]==i)
			ind[i]=++cnt;
	for(int i=1;i<=n;i++)
		cout<<ind[anc(scc[i])]<<" ";
	return 0;
}

Details

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Test #1:

score: 0
Dangerous Syscalls

input:

5 5
1 4
2 3
1 3
2 5
5 1

output:


result: