QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#741191#8720. BFS 序 0ucup-team4352#AC ✓352ms79424kbC++233.0kb2024-11-13 13:44:392024-11-13 13:44:39

Judging History

你现在查看的是最新测评结果

  • [2024-11-13 13:44:39]
  • 评测
  • 测评结果:AC
  • 用时:352ms
  • 内存:79424kb
  • [2024-11-13 13:44:39]
  • 提交

answer

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define log(x) (31^__builtin_clz(x))
using namespace std;
const int maxn=3e5+5;
vector<int>e[maxn],s[maxn];
int f[maxn],dfn[maxn],dep[maxn];
int st[maxn][20],fa[maxn][20];
int tot;
inline int get(int x,int y){
	return dep[x]<dep[y]?x:y;
}
int lca(int x,int y){
	x=dfn[x];y=dfn[y];
	if(x>y)swap(x,y);
	x++;
	int tmp=log(y-x+1);
	return get(st[x][tmp],st[y-(1<<tmp)+1][tmp]);
}
void dfs(int x){
	dfn[x]=++tot;
	if(x==1)dep[x]=1;
	fa[x][0]=st[dfn[x]][0];
	for(int i=1;i<20;i++)fa[x][i]=fa[fa[x][i-1]][i-1];
	for(auto u:e[x]){
		dep[u]=dep[x]+1;
		st[tot+1][0]=x;
		dfs(u);
	}
}
bool cmp(int a,int b){
	return dfn[a]<dfn[b];
}
int flag=0;
int instack[maxn],vis[maxn];
int find(int x,int y){
	for(int i=19;i>=0;i--){
		if(y>>i&1)x=fa[x][i];
	}
	return x;
}
int build(vector<int>t){
	sort(t.begin(),t.end(),cmp);
	t.resize(unique(t.begin(),t.end())-t.begin());

	for(int i=(int)t.size()-1;i;i--){
		t.push_back(lca(t[i],t[i-1]));
	}

	sort(t.begin(),t.end(),cmp);
	t.resize(unique(t.begin(),t.end())-t.begin());

	for(auto u:t)s[u].clear(),vis[u]=instack[u]=0;

	vector<int>st;
	for(auto u:t){
		if(st.empty())st.push_back(u);
		else{
			while(st.size()&&lca(st.back(),u)!=st.back())st.pop_back();
			if(st.size()){
				s[st.back()].push_back(u);
			}
		}
	}
	return t[0];
}
void dfs2(int x){
	if(instack[x]){
		flag=1;
		return;
	}
	if(vis[x]||flag)return;
	instack[x]=1;
	vis[x]=1;
	for(auto u:s[x]){
		if(flag)break;
		dfs2(u);
	}
	instack[x]=0;
}
void solve(){
	int n;
	cin>>n;
	for(int i=2;i<=n;i++){
		cin>>f[i];
		e[f[i]].push_back(i);
	}
	dfs(1);
	for(int i=n;i>=1;i--){
		for(int j=1;j<20;j++){
			st[i][j]=get(st[i][j-1],st[min(n,i+(1<<j-1))][j-1]);
		}
	}
	int q;
	cin>>q;
	while(q--){
		int m;
		cin>>m;
		vector<int>p;
		flag=0;
		for(int i=1;i<=m;i++){
			int x;
			cin>>x;
			if(i>1){
				if(dep[x]<dep[p.back()])flag=1;
			}
			p.push_back(x);
		}
		if(flag){
			cout<<"No\n";
			continue;
		}
		vector<int>r=p;
		sort(r.begin(),r.end());
		r.resize(unique(r.begin(),r.end())-r.begin());
		if(r.size()!=p.size()){
			cout<<"No\n";continue;
		}
		vector<int>p1=p;
		for(int i=1;i<m;i++){
			if(dep[p[i]]==dep[p[i-1]]){
				int l=lca(p[i-1],p[i]);
				int d=dep[p[i]]-dep[l]-1;
				if(l)p1.push_back(find(p[i],d)),p1.push_back(find(p[i-1],d));
			}
		}
		int rt=build(p1);
		for(int i=0;i+1<p.size();i++){
			if(dep[p[i]]==dep[p[i+1]]){
				int l=lca(p[i+1],p[i]);
				int d=dep[p[i]]-dep[l]-1;
				// cout<<l<<" "<<d<<"!!!\n";
				s[find(p[i],d)].push_back(find(p[i+1],d));
				// cout<<find(p[i],d)<<" "<<find(p[i+1],d)<<"\n";
			}
		}
		dfs2(rt);
		if(flag){
			cout<<"No\n";
			continue;
		}
		cout<<"Yes\n";
	}
}
int main(){
	ios::sync_with_stdio(0),cin.tie(0);
	int t=1;
	// cin>>t;
	while(t--)solve();
	return 0;
}
/*
7
1 1 2 2 3 3
1
5 1 3 2 7 5


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
*/

这程序好像有点Bug,我给组数据试试?

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 7736kb

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: 0
Accepted
time: 346ms
memory: 78380kb

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
Yes
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
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
No
No
Yes
Yes
Yes
No
No
No
Y...

result:

ok 254 token(s): yes count is 89, no count is 165

Test #3:

score: 0
Accepted
time: 352ms
memory: 79424kb

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:

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

result:

ok 266 token(s): yes count is 102, no count is 164

Test #4:

score: 0
Accepted
time: 347ms
memory: 79412kb

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

result:

ok 252 token(s): yes count is 87, no count is 165

Test #5:

score: 0
Accepted
time: 6ms
memory: 7664kb

input:

10
1 1 3 3 1 3 1 3 9
10000
4 3 5 6 9
5 3 1 4 9 6
5 6 4 3 5 7
28 8 3 4 3 1 6 3 5 8 7 2 4 4 4 2 7 5 9 2 4 10 8 4 10 3 4 5 7
3 5 2 9
6 4 7 2 3 9 5
5 9 2 5 6 1
12 3 5 8 8 1 3 5 8 4 5 9 1
29 3 9 9 1 5 8 5 5 6 10 8 8 4 8 4 2 8 10 5 7 3 7 1 8 4 7 5 1 6
7 5 9 8 3 2 1 6
4 4 1 9 5
22 10 9 5 4 5 8 10 3 2 1 10 ...

output:

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

result:

ok 10000 token(s): yes count is 1058, no count is 8942

Test #6:

score: 0
Accepted
time: 6ms
memory: 7620kb

input:

9
1 2 1 2 2 4 2 6
10000
6 5 1 4 3 7 8
14 6 8 7 9 7 5 1 8 3 6 3 8 5 2
2 6 9
17 7 8 6 5 2 1 5 5 9 3 4 1 5 2 7 2 5
3 8 6 5
5 3 9 1 6 8
8 3 5 8 7 9 4 6 2
4 8 9 6 5
7 4 7 2 9 3 8 1
6 1 4 9 5 6 2
4 7 5 4 3
5 9 5 2 1 3
4 4 5 7 3
3 9 1 8
4 4 2 8 6
26 7 4 7 6 1 7 9 4 5 5 8 9 8 2 4 8 9 6 2 8 6 4 5 5 4 4
45 3 ...

output:

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

result:

ok 10000 token(s): yes count is 1492, no count is 8508

Test #7:

score: 0
Accepted
time: 2ms
memory: 7656kb

input:

8
1 1 2 4 2 4 6
10000
5 2 6 6 2 1
3 7 3 8
2 8 1
5 7 5 1 2 7
3 2 3 5
3 8 4 3
5 8 2 4 5 3
4 3 2 1 8
6 6 8 4 5 3 1
6 3 1 2 7 4 6
4 8 6 4 3
5 4 7 6 8 5
11 2 1 6 5 2 7 1 3 3 5 4
4 6 1 7 2
7 6 2 7 8 4 1 3
3 4 6 7
3 7 1 6
38 3 4 6 6 3 4 8 1 5 3 1 8 8 6 2 3 6 7 8 8 4 2 3 7 3 3 6 7 7 5 7 5 8 8 5 4 5 7
1 8
5 ...

output:

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

result:

ok 10000 token(s): yes count is 1568, no count is 8432

Test #8:

score: 0
Accepted
time: 5ms
memory: 7732kb

input:

7
1 2 3 1 2 5
10000
5 1 7 3 5 6
5 5 3 2 7 4
4 5 2 6 4
12 3 1 5 5 6 6 3 5 3 5 3 3
11 2 3 2 6 7 3 6 6 3 3 3
2 3 2
6 1 3 4 2 6 7
3 2 7 1
6 5 2 7 3 4 1
27 2 5 6 1 7 1 7 1 4 6 7 1 6 2 1 7 1 3 4 4 7 7 2 6 4 4 3
2 5 6
1 7
3 3 1 4
4 1 7 3 4
3 4 2 1
4 4 1 6 7
4 6 2 7 4
4 5 1 6 4
1 3
5 1 2 3 5 7
5 2 3 7 6 5
1...

output:

No
No
Yes
No
No
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
No
Yes
No
No
No
No
Yes
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Ye...

result:

ok 10000 token(s): yes count is 2205, no count is 7795

Extra Test:

score: 0
Extra Test Passed