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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#693890#8551. DFS Order 5sdmrlhWA 30ms16848kbC++142.5kb2024-10-31 16:55:222024-10-31 16:55:22

Judging History

你现在查看的是最新测评结果

  • [2024-10-31 16:55:22]
  • 评测
  • 测评结果:WA
  • 用时:30ms
  • 内存:16848kb
  • [2024-10-31 16:55:22]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define sf(x) scanf("%lld",&x)
#define sff(x,y) scanf("%lld%lld",&x,&y)
#define endl '\n'
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define pf(x) printf("%lld",x)
#define pii pair<int,int> 
#define f first 
#define s second
#define int long long



//
const int N = 1e5+10,M=2*N;
unordered_map<int,int> ve[N];
int h[N],e[M],ne[M],idx;
int si[N],q[M],depth[N],dis[N],fa[N][30];
int now[N],nn,bl;
vector<int> c;
//
void add(int a,int b)
{
	ne[idx]=h[a],e[idx]=b,h[a]=idx++;
}

void no()
{
	cout<<"No"<<endl;
	bl=1;
}

void dfs(int u,int fa)
{
	for(int i=h[u];~i;i=ne[i])
	{
		int j=e[i];
		if(j==fa) continue;
		ve[u][j]=1;
		dfs(j,u);
		si[u]+=si[j];
	}
}
void bfs(int root)
{
	memset(depth, 0x3f, sizeof depth);
	depth[0] = 0, depth[root] = 1;
	int hh = 0, tt = 0;
	q[0] = root;
	while (hh <= tt)
	{
		int t = q[hh ++ ];
		for (int i = h[t]; ~i; i = ne[i])
		{
			int j = e[i];
			if (depth[j] > depth[t] + 1)
			{
				depth[j] = depth[t] + 1;
				q[ ++ tt] = j;
				fa[j][0] = t;
				for (int k = 1; k <= 15; k ++ )
					fa[j][k] = fa[fa[j][k - 1]][k - 1];
			}
		}
	}
}

int lca(int a, int b)
{
	if (depth[a] < depth[b]) swap(a, b);
	for (int k = 15; k >= 0; k -- )
		if (depth[fa[a][k]] >= depth[b])
			a = fa[a][k];
	if (a == b) return a;
	for (int k = 15; k >= 0; k -- )
		if (fa[a][k] != fa[b][k])
		{
			a = fa[a][k];
			b = fa[b][k];
		}
	return fa[a][0];
}

bool panduan(int l,int r)
{ 
	int now=c[l];
	int nn = l;
	while(nn!=r)
	{
		if(ve[now].count(c[nn+1]))
		{
			ve[now].erase(c[nn+1]);
			int nowr=min(nn+si[c[nn+1]],(int)c.size()-1);
			if(nowr>r) return 0;
			if(!panduan(nn+1,nowr)) return 0;
			nn = nowr;
		}
		else return 0;
	}
	return 1;
	
}

//


void solve()
{
	int m,n;
	cin>>m>>n;
	for(int i=1;i<=m;i++) h[i]=-1,si[i]=1;
	for(int i=1;i<m;i++)
	{
		int a,b;
		cin>>a>>b;
		add(a,b),add(b,a);
	}
	dfs(1,-1);
	bfs(1);	
	while(n--)
	{
		cin>>nn;
		for(int i=1;i<=nn;i++) cin>>now[i];	
		int l=1,r = 1,last=-1;
		while(l<=nn)
		{
			bl=0;
			if(last!=-1&&(lca(now[1],now[l])==now[l]||lca(fa[last][0],fa[now[l]][0])!=fa[now[l]][0])){
				no();
				break;
			}
			r=l;
			last=now[l];
			c.clear();
			for(int i=l;i<=min(nn,l+si[now[l]]-1);i++,r++)
				c.push_back(now[i]);
			l=r;
			if(!panduan(0,c.size()-1)) {
				no();
				break;
			}
		}
		if(!bl) cout<<"Yes"<<endl;
	}
}
signed main()
{
	IOS;
	int _=1;
	while(_--)
		solve();
	return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 3ms
memory: 16848kb

input:

6 7
1 2
1 3
2 4
3 5
2 6
2 4 1
2 4 2
2 4 3
2 4 4
2 4 5
2 4 6
6 1 2 6 4 3 5

output:

No
No
Yes
No
No
Yes
Yes

result:

ok 7 tokens

Test #2:

score: -100
Wrong Answer
time: 30ms
memory: 15568kb

input:

10 100000
7 2
1 7
7 10
8 6
8 7
1 3
4 5
9 5
5 8
8 8 9 7 2 8 1 6 1
4 8 3 5 2
6 7 10 3 9 9 1
1 1
8 10 3 2 9 3 8 7 3
7 5 6 2 8 5 9 1
6 3 4 6 2 1 3
5 8 9 2 4 9
1 3
2 1 5
5 8 5 1 7 9
10 5 2 9 2 6 4 10 6 3 8
3 4 5 8
2 8 4
9 4 10 1 2 4 3 3 6 3
1 3
6 1 1 6 8 3 1
3 7 3 2
3 9 1 5
4 3 7 8 10
9 4 2 3 10 2 5 4 3 ...

output:

No
No
No
Yes
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No...

result:

wrong answer 71st words differ - expected: 'Yes', found: 'No'