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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#373782#5201. Cactus Meets TorusInfinityNSWA 7ms6364kbC++142.7kb2024-04-02 05:46:242024-04-02 05:46:26

Judging History

你现在查看的是最新测评结果

  • [2024-04-02 05:46:26]
  • 评测
  • 测评结果:WA
  • 用时:7ms
  • 内存:6364kb
  • [2024-04-02 05:46:24]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
#define pb push_back

const int N=100050;
vector<int> E[N];
void AddEdge(int u,int v){
	E[u].pb(v);
	E[v].pb(u);
}
int par[N];
bool was[N];
vector<int> cycLca;
vector<pair<int,int>> cyc;
int cnt[N];
int lid[N],rid[N],tid;
void DFS(int u,int p){
	par[u]=p;
	was[u]=true;
	lid[u]=++tid;
	for(int v:E[u]){
		if(v!=p){
			if(was[v]){
				if(lid[v]<lid[u]){
					cycLca.pb(v);
					cyc.pb({u,v});
					for(int i=u;i!=par[v];i=par[i]){
						cnt[i]++;
					}
				}
			}else{
				DFS(v,u);
			}
		}
	}
	rid[u]=tid;
}
bool In(int a,int b){
	return lid[a]<=lid[b] && rid[a]>=lid[b];
}
int main(){
	while(true){
		int n,m;
		scanf("%i %i",&n,&m);
		if(n==0)break;
		for(int i=1;i<=m;i++){
			int sz;
			scanf("%i",&sz);
			vector<int> nodes(sz,0);
			for(int&j:nodes)scanf("%i",&j);
			for(int j=1;j<nodes.size();j++){
				AddEdge(nodes[j-1],nodes[j]);
			}
		}

		cycLca.clear();
		DFS(1,0);
		sort(cycLca.begin(),cycLca.end(),[&](int i,int j){return lid[i]<lid[j];});
		sort(cyc.begin(),cyc.end(),[&](pair<int,int> a,pair<int,int> b){return lid[a.second]<lid[b.second];});
		int lastCycNode=cyc.size()?cyc.back().first:0;
		for(int i=1;i<=n;i++){
			was[i]=false;
			par[i]=0;
			cnt[i]=0;
		}
		//printf("lastCycNode %i\n",lastCycNode);
		if(!lastCycNode){
			printf("Yes\n");
		}else{
			cycLca.clear();
			cyc.clear();
			DFS(lastCycNode,0);
			//printf("lastCycNode %i\n",lastCycNode);
			bool ok=true;
			sort(cycLca.begin(),cycLca.end(),[&](int i,int j){return lid[i]<lid[j];});
			int fir=cycLca.front();
			int las=cycLca.back();
			//for(int lca:cycLca)printf("cycLca %i (%i %i)\n",lca,lid[lca],rid[lca]);
			for(int i=1;i<cycLca.size();i++){
				//printf("cycLca %i\n",lca);
				if(rid[cycLca[i-1]]<lid[cycLca[i]]){
					ok=false;
				}
			}
			if(ok){
				ok=false;
				bool good=true;
				for(auto p:cyc){
					int deg=0,sec=0;
					for(int i=p.first;i!=par[p.second];i=par[i]){
						deg+=cnt[i]-1;
						if(cnt[i]>1)sec++;
					}
					if(deg==cyc.size()-1)ok=true;
					//if(sec>2 || (sec>1 && cnt[par[p.second]]==0 && par[p.second]!=0))good=false;
					//if(sec>1 && (p.second==fir || p.second==las))good=false;
				}
				sort(cyc.begin(),cyc.end(),[&](pair<int,int> a,pair<int,int> b){return lid[a.second]<lid[b.second];});
				//for(auto p:cyc)printf("(%i %i)\n",p.first,p.second);
				for(int i=2;i<cyc.size();i++){
					if(In(cyc[i-2].second,cyc[i].second) && In(cyc[i].second,cyc[i-2].first))good=false;
				}
				if(ok || good)printf("Yes\n");
				else printf("No\n");
			}else{
				printf("No\n");
			}
		}

		for(int i=1;i<=n;i++){
			was[i]=false;
			par[i]=0;
			E[i].clear();
			cnt[i]=0;
		}
		tid=0;
	}
	return 0;
}

详细

Test #1:

score: 100
Accepted
time: 1ms
memory: 6176kb

input:

6 1
8 1 2 3 1 4 5 6 4
10 2
9 1 2 3 1 10 4 5 6 4
5 7 8 9 7 10
0 0

output:

Yes
No

result:

ok 2 token(s): yes count is 1, no count is 1

Test #2:

score: 0
Accepted
time: 2ms
memory: 6080kb

input:

15 3
9 1 2 3 4 5 6 7 8 3
7 2 9 10 11 12 13 10
5 2 14 9 15 10
15 7
3 1 2 3
3 4 2 5
3 6 2 7
3 8 2 9
3 10 2 11
3 12 2 13
3 14 2 15
1 0
2 1
2 1 2
2 1
2 2 1
3 1
4 1 3 2 1
4 2
3 1 2 3
2 2 4
6 2
5 1 2 3 4 5
2 4 6
7 3
5 1 2 3 4 5
2 4 6
2 4 7
7 2
6 1 2 3 4 5 6
2 5 7
8 3
6 1 2 3 4 5 6
2 5 7
2 5 8
9 4
5 1 2 3 ...

output:

Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes

result:

ok 18 token(s): yes count is 18, no count is 0

Test #3:

score: -100
Wrong Answer
time: 7ms
memory: 6364kb

input:

6 1
8 6 1 2 3 1 4 5 1
6 1
8 5 1 2 3 1 4 6 1
6 1
8 4 1 2 3 1 5 6 1
6 2
6 4 1 2 3 1 5
2 1 6
6 1
8 6 1 2 4 1 3 5 1
6 1
8 5 1 2 4 1 3 6 1
6 1
8 3 1 2 4 1 5 6 1
6 2
6 3 1 2 4 1 5
2 1 6
6 1
8 6 1 2 5 1 3 4 1
6 1
8 4 1 2 5 1 3 6 1
6 1
8 3 1 2 5 1 4 6 1
6 2
6 3 1 2 5 1 4
2 1 6
6 1
8 5 1 2 6 1 3 4 1
6 1
8 4 ...

output:

Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
...

result:

wrong answer expected YES, found NO [8746th token]