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#741119#8720. BFS 序 0ucup-team4352#WA 348ms79608kbC++232.8kb2024-11-13 13:24:462024-11-13 13:24:46

Judging History

你现在查看的是最新测评结果

  • [2024-11-13 13:24:46]
  • 评测
  • 测评结果:WA
  • 用时:348ms
  • 内存:79608kb
  • [2024-11-13 13:24:46]
  • 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;
	// cout<<lca(4,7)<<"\n";
	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);
		}
		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));
			}
		}
		if(flag){
			cout<<"No\n";
			continue;
		}
		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;
}

详细

Test #1:

score: 100
Accepted
time: 2ms
memory: 11760kb

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: 333ms
memory: 78696kb

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: 338ms
memory: 79608kb

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: 348ms
memory: 79536kb

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: 8ms
memory: 11768kb

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: -100
Wrong Answer
time: 7ms
memory: 7672kb

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:

wrong answer expected NO, found YES [4993rd token]