QOJ.ac

QOJ

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
#603110#8720. BFS 序 0Kanate#WA 72ms41348kbC++143.2kb2024-10-01 14:44:482024-10-01 14:44:50

Judging History

你现在查看的是最新测评结果

  • [2024-10-01 14:44:50]
  • 评测
  • 测评结果:WA
  • 用时:72ms
  • 内存:41348kb
  • [2024-10-01 14:44:48]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define int long long 
#define rint int
#define endl '\n'
#define uint unsigned long long
void debug(int *a,int n){for(rint i=1;i<=n;i++) cout<<a[i]<<" ";cout<<endl;}
void debug(int *a){for(rint i=1;a[i];i++) cout<<a[i]<<" ";cout<<endl;}
void debug(int x){cout<<"debug: "<<x<<endl;}
int read(){
    int x=0,f=1;char c=getchar();
    while(!isdigit(c)){if(c=='-')f=-1;c=getchar();}
    while(isdigit(c))x=x*10+c-48,c=getchar();
    return x*f;
}const int N=3e5+10,p=1e9,mod=998244353;

int n;
vector<int> e[N];
int d[N],FA[N],sz[N],son[N],top[N],dfn[N],idx;

void dfs(int x=1,int fa=1,int dep=1)
{
	d[x]=dep,FA[x]=fa,sz[x]=1;
	for(auto &it:e[x])
	if(it!=fa) 
	{
		dfs(it,x,dep+1);
		sz[x]+=sz[it];
		if(sz[it]>sz[son[x]]) son[x]=it;
	}
}
void dfs2(int x=1,int tp=1)
{
	top[x]=tp,dfn[x]=++idx;
	if(!son[x]) return;
	dfs2(son[x],tp);
	for(auto &it:e[x])
	if(it!=FA[x]&&it!=son[x]) dfs2(it,it);
}
int lca(int x,int y)
{
	while(top[x]!=top[y])
	{
		if(d[top[x]]<d[top[y]]) swap(x,y);
		x=FA[top[x]];
	}
	if(d[x]>d[y]) swap(x,y);
	return x;
}
int dis(int x,int y)
{
	return d[x]+d[y]-2*d[lca(x,y)];
}


struct tree{
	int v[N<<2];
	void build(int l=1,int r=n,int now=1)
	{
		v[now]=p;
		if(l==r) return;
		int mid=(l+r)>>1;
		build(l,mid,now<<1),build(mid+1,r,now<<1|1);
	}
	void modify(int k,int x,int l=1,int r=n,int now=1)
	{
		if(l==r) return v[now]=x,void();
		int mid=(l+r)>>1;
		if(k<=mid) modify(k,x,l,mid,now<<1);
		else modify(k,x,mid+1,r,now<<1|1);
		v[now]=min(v[now<<1],v[now<<1|1]);
	}
	int ask(int ll,int rr,int l=1,int r=n,int now=1)
	{
		// cout<<ll<<" "<<rr<<" "<<l<<" "<<r<<" "<<now<<endl;
		if(ll<=l&&r<=rr) return v[now];
		int mid=(l+r)>>1,res=p;
		if(ll<=mid) res=min(res,ask(ll,rr,l,mid,now<<1));
		if(rr>mid)  res=min(res,ask(ll,rr,mid+1,r,now<<1|1));
		return res;
	}
}t;

int m,b[N],c[N];

bool check()
{
	b[m+1]=0;
	for(rint i=1;i<m;i++) if(d[b[i]]>d[b[i+1]]) return 0;
	
	for(rint i=1;i<=m+1;i++) c[i]=b[i];
	for(rint l=1;l<=m;l++)
	{
		int r=l;
		while(d[b[r+1]]==d[b[l]]) r++;
		
		sort(c+l,c+r+1,[&](const int &A,const int &B){return dfn[A]<dfn[B];});
		int nows=0;
		for(rint i=l;i<r;i++) nows+=dis(b[i],b[i+1]);
		int bess=0;
		for(rint i=l;i<r;i++) bess+=dis(c[i],c[i+1]);
		
		if(nows!=bess) return 0;
		l=r;
	}
	
	// puts("get");
	reverse(b+1,b+m+1);
	for(rint l=1;l<=m;l++)
	{
		int r=l;
		while(d[b[r+1]]==d[b[l]]) r++;
		
		for(rint i=l;i<r;i++)
		{
			// puts("{");
			
			int x=t.ask(dfn[b[i]],dfn[b[i]]+sz[b[i]]-1);
			int y=t.ask(dfn[b[i+1]],dfn[b[i+1]]+sz[b[i+1]]-1);
			// puts("}");
			
			if(x!=p&&y!=p&&x>y)
			{
				for(rint j=1;j<l;j++) t.modify(dfn[b[j]],p);
				return 0;
			}
		}
		for(rint i=l;i<=r;i++) t.modify(dfn[b[i]],i);
		
		l=r;
	}
	
	for(rint j=1;j<=m;j++) t.modify(dfn[b[j]],p);
	return 1;
}


void Work()
{
	n=read();
	for(rint i=2;i<=n;i++)
		e[read()].push_back(i);
	dfs();
	dfs2();
	t.build();
	
	int q=read();
	while(q--)
	{
		m=read();
		for(rint i=1;i<=m;i++) b[i]=read();
		
		// for(rint i=1;i<=m;i++) cout<<b[i]<<" ";cout<<endl;
		
		puts(check()?"Yes":"No");
	}
}


signed main()
{
	// freopen("1.in","r",stdin);
	Work();
    return 0;
}

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 24624kb

input:

6
1 1 3 2 4
10
4 3 6 2 5
1 4
3 2 4 5
5 2 5 4 6 3
3 1 4 2
3 5 6 3
5 4 5 2 6 1
4 4 3 2 5
4 4 6 2 3
3 3 2 6

output:

No
Yes
Yes
No
No
No
No
No
No
Yes

result:

ok 10 token(s): yes count is 3, no count is 7

Test #2:

score: -100
Wrong Answer
time: 72ms
memory: 41348kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

No
Yes
No
Yes
No
No
No
No
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
No
No
Yes
No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
No
No
No
No
No
Yes
No
No
No
Yes
No
No
Yes
No
No
Yes
No
Yes
No
No
No
Yes
N...

result:

wrong answer expected YES, found NO [3rd token]