QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #416220 | #8720. BFS 序 0 | zjx666 | WA | 247ms | 117400kb | C++14 | 1.4kb | 2024-05-21 17:54:13 | 2024-05-21 17:54:14 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int maxn=500010;
int d[maxn];
vector<int>e[maxn];
vector<int>s[maxn];
int a[maxn];
int f[maxn][30];
int vi[maxn];
void bfs(int x,int deep)
{
d[x]=deep+1;
for(int i=1;i<=25;i++)
{
f[x][i]=f[f[x][i-1]][i-1];
}
for(int i=0;i<e[x].size();i++)
{
f[e[x][i]][0]=x;
bfs(e[x][i],d[x]);
}
}
bool lca(int x,int y)
{
for(int i=25;i>=0;i--)
{
if(f[x][i]!=f[y][i])
{
x=f[x][i];
y=f[y][i];
}
}
for(int i=0;i<s[y].size();i++)
{
if(s[y][i]==x)return 0;
}
e[x].push_back(y);
return 1;
}
signed main()
{
ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
int n;
cin>>n;
for(int i=2;i<=n;i++)
{
int x;
cin>>x;
e[x].push_back(i);
}
f[1][0]=1;
bfs(1,0);
int q;
cin>>q;
while(q--)
{
for(int i=1;i<=n;i++)
{
s[i].clear();
vi[i]=0;
}
int m,v=1;
cin>>m;
for(int i=1;i<=m&&v;i++)
{
cin>>a[i];
if(vi[a[i]])v=0;
vi[a[i]]=1;
}
for(int i=2;i<=m&&v;i++)
{
if(d[a[i]]==d[a[i-1]])
{
if(!lca(a[i-1],a[i]))v=0;
}
else if(d[a[i]]>d[a[i-1]])continue;
else
{
v=0;
break;
}
}
if(!v)cout<<"NO\n";
else cout<<"YES\n";
}
return 0;
}
/*
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
*/
Details
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Test #1:
score: 100
Accepted
time: 3ms
memory: 32276kb
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: 247ms
memory: 117400kb
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 YES NO NO ...
result:
wrong answer expected NO, found YES [87th token]