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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#534386 | #8551. DFS Order 5 | rotcar07 | WA | 27ms | 8956kb | C++14 | 1.9kb | 2024-08-27 08:20:56 | 2024-08-27 08:20:56 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
constexpr int maxn=1e5+5;
int n,q;
vector<int> e[maxn];
int tqm,sz[maxn],dfn[maxn],st[maxn][25],fa[maxn];
inline int cmin(int x,int y){return dfn[x]<dfn[y]?x:y;}
void dfs(int p,int f){
dfn[p]=++tqm;st[dfn[p]-1][0]=f;fa[p]=f;
sz[p]=1;
vector<int> tmp;
for(auto x:e[p]) if(x!=f)dfs(x,p),sz[p]+=sz[x],tmp.push_back(x);
swap(e[p],tmp);
}
inline int lca(int x,int y){
if(x==y) return x;
x=dfn[x],y=dfn[y];
if(x>y) swap(x,y);
int k=__lg(y-x);
// cout<<x<<' '<<y<<' '<<k<<' '<<st[x][k]<<' '<<st[y-(1<<k)][k]<<'\n';
return cmin(st[x][k],st[y-(1<<k)][k]);
}
int cnt[maxn];
int main(){
ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
cin>>n>>q;
for(int i=1,u,v;i<n;i++) cin>>u>>v,e[u].push_back(v),e[v].push_back(u);
dfs(1,0);
for(int j=1;1<<j<n;j++)
for(int l=1;l+(1<<j)-1<n;l++)
st[l][j]=cmin(st[l][j-1],st[l+(1<<j-1)][j-1]);
while(q--){
int k;cin>>k;
vector<int> a(k);
for(auto&x:a) cin>>x,cnt[x]=0;
stack<int> st;st.push(a[0]);
for(int i=1;i<k;i++){
int lst=0;
while(!st.empty()&&cnt[st.top()]==e[st.top()].size()) lst=st.top(),st.pop();
// cout<<i<<' '<<a[i]<<' '<<lst<<' '<<st.top()<<' '<<e[st.top()].size()<<' '<<cnt[st.top()]<<' '<<st.size()<<'\n';
if(!st.empty()){
if(fa[a[i]]==st.top()) cnt[st.top()]++,st.push(a[i]);
else{
goto fail;
}
}
if(st.empty()){
// cout<<a[i]<<' '<<lst<<' '<<lca(a[i],lst)<<'\n';
if(fa[a[i]]==lca(a[i],lst)){
st.push(a[i]);
}
else goto fail;
}
}
cout<<"Yes\n";
continue;
fail:
cout<<"No\n";
}
}
Details
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Test #1:
score: 100
Accepted
time: 2ms
memory: 8496kb
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: 27ms
memory: 8956kb
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 Yes No No Yes Yes No No No No Yes No No No No No No No No Yes No No No No No No No ...
result:
wrong answer 89th words differ - expected: 'No', found: 'Yes'