QOJ.ac
QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#741119 | #8720. BFS 序 0 | ucup-team4352# | WA | 348ms | 79608kb | C++23 | 2.8kb | 2024-11-13 13:24:46 | 2024-11-13 13:24:46 |
Judging History
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]