QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#693890 | #8551. DFS Order 5 | sdmrlh | WA | 30ms | 16848kb | C++14 | 2.5kb | 2024-10-31 16:55:22 | 2024-10-31 16:55:22 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define sf(x) scanf("%lld",&x)
#define sff(x,y) scanf("%lld%lld",&x,&y)
#define endl '\n'
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define pf(x) printf("%lld",x)
#define pii pair<int,int>
#define f first
#define s second
#define int long long
//
const int N = 1e5+10,M=2*N;
unordered_map<int,int> ve[N];
int h[N],e[M],ne[M],idx;
int si[N],q[M],depth[N],dis[N],fa[N][30];
int now[N],nn,bl;
vector<int> c;
//
void add(int a,int b)
{
ne[idx]=h[a],e[idx]=b,h[a]=idx++;
}
void no()
{
cout<<"No"<<endl;
bl=1;
}
void dfs(int u,int fa)
{
for(int i=h[u];~i;i=ne[i])
{
int j=e[i];
if(j==fa) continue;
ve[u][j]=1;
dfs(j,u);
si[u]+=si[j];
}
}
void bfs(int root)
{
memset(depth, 0x3f, sizeof depth);
depth[0] = 0, depth[root] = 1;
int hh = 0, tt = 0;
q[0] = root;
while (hh <= tt)
{
int t = q[hh ++ ];
for (int i = h[t]; ~i; i = ne[i])
{
int j = e[i];
if (depth[j] > depth[t] + 1)
{
depth[j] = depth[t] + 1;
q[ ++ tt] = j;
fa[j][0] = t;
for (int k = 1; k <= 15; k ++ )
fa[j][k] = fa[fa[j][k - 1]][k - 1];
}
}
}
}
int lca(int a, int b)
{
if (depth[a] < depth[b]) swap(a, b);
for (int k = 15; k >= 0; k -- )
if (depth[fa[a][k]] >= depth[b])
a = fa[a][k];
if (a == b) return a;
for (int k = 15; k >= 0; k -- )
if (fa[a][k] != fa[b][k])
{
a = fa[a][k];
b = fa[b][k];
}
return fa[a][0];
}
bool panduan(int l,int r)
{
int now=c[l];
int nn = l;
while(nn!=r)
{
if(ve[now].count(c[nn+1]))
{
ve[now].erase(c[nn+1]);
int nowr=min(nn+si[c[nn+1]],(int)c.size()-1);
if(nowr>r) return 0;
if(!panduan(nn+1,nowr)) return 0;
nn = nowr;
}
else return 0;
}
return 1;
}
//
void solve()
{
int m,n;
cin>>m>>n;
for(int i=1;i<=m;i++) h[i]=-1,si[i]=1;
for(int i=1;i<m;i++)
{
int a,b;
cin>>a>>b;
add(a,b),add(b,a);
}
dfs(1,-1);
bfs(1);
while(n--)
{
cin>>nn;
for(int i=1;i<=nn;i++) cin>>now[i];
int l=1,r = 1,last=-1;
while(l<=nn)
{
bl=0;
if(last!=-1&&(lca(now[1],now[l])==now[l]||lca(fa[last][0],fa[now[l]][0])!=fa[now[l]][0])){
no();
break;
}
r=l;
last=now[l];
c.clear();
for(int i=l;i<=min(nn,l+si[now[l]]-1);i++,r++)
c.push_back(now[i]);
l=r;
if(!panduan(0,c.size()-1)) {
no();
break;
}
}
if(!bl) cout<<"Yes"<<endl;
}
}
signed main()
{
IOS;
int _=1;
while(_--)
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 3ms
memory: 16848kb
input:
6 7 1 2 1 3 2 4 3 5 2 6 2 4 1 2 4 2 2 4 3 2 4 4 2 4 5 2 4 6 6 1 2 6 4 3 5
output:
No No Yes No No Yes Yes
result:
ok 7 tokens
Test #2:
score: -100
Wrong Answer
time: 30ms
memory: 15568kb
input:
10 100000 7 2 1 7 7 10 8 6 8 7 1 3 4 5 9 5 5 8 8 8 9 7 2 8 1 6 1 4 8 3 5 2 6 7 10 3 9 9 1 1 1 8 10 3 2 9 3 8 7 3 7 5 6 2 8 5 9 1 6 3 4 6 2 1 3 5 8 9 2 4 9 1 3 2 1 5 5 8 5 1 7 9 10 5 2 9 2 6 4 10 6 3 8 3 4 5 8 2 8 4 9 4 10 1 2 4 3 3 6 3 1 3 6 1 1 6 8 3 1 3 7 3 2 3 9 1 5 4 3 7 8 10 9 4 2 3 10 2 5 4 3 ...
output:
No No No Yes No No No No Yes No No No No No No Yes No No No No No No No No No No No No No No No Yes No No No No No No Yes No No No No No Yes Yes 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 Yes No No No No Yes No No No No No No No No No No No No No No No No No...
result:
wrong answer 71st words differ - expected: 'Yes', found: 'No'