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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#603122 | #8720. BFS 序 0 | Kanate# | WA | 53ms | 39952kb | C++14 | 3.3kb | 2024-10-01 14:49:16 | 2024-10-01 14:49:19 |
Judging History
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;
}
return 1;
// 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<=m;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;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 23120kb
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: 53ms
memory: 39952kb
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:
wrong answer expected NO, found YES [181st token]