QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#416976 | #8720. BFS 序 0 | opbnbjs | WA | 215ms | 78384kb | C++14 | 2.5kb | 2024-05-22 11:53:05 | 2024-05-22 11:53:05 |
Judging History
answer
#include<bits/stdc++.h>
#define V vector
#define pb push_back
#define mp make_pair
#define F first
#define S second
using namespace std;
const int maxn = 3e5+5;
int fno[maxn][35],dep[maxn];
V<int> g[maxn];
void dfs(int x,int fa){
dep[x] = dep[fa]+1;
fno[x][0] = fa;
for(int i=1;i<=30;i++){
fno[x][i] = fno[fno[x][i-1]][i-1];
}
for(auto i:g[x]){
if(i==fa) continue;
dfs(i,x);
}
}
set<int> f[maxn];
int lca(int x,int y){
if(dep[x]>dep[y]) swap(x,y);
int dif = dep[y]-dep[x];
for(int i=0;dif;i++,dif>>=1){
if(dif&1==1) y = fno[y][i];
}
if(x==y) return x;
for(int i=30;i>=0&&y!=x;i--){
if(fno[x][i]!=fno[y][i]){
x = fno[x][i];
y = fno[y][i];
}
}
return fno[x][0];
}
int getfa(int x,int y){
if(dep[x]>dep[y]) swap(x,y);
int dif = dep[y]-dep[x]-1;
for(int i=0;dif;i++,dif>>=1){
if(dif&1==1) y = fno[y][i];
}
if(x==fno[y][0]) return y;
}
map<int,int> vis;
int ind[maxn];
void solve(){
int n;
cin>>n;
for(int i=2;i<=n;i++){
int fa;
cin>>fa;
g[fa].pb(i);
}
dfs(1,0);
int q;
cin>>q;
while(q--){
int m;
cin>>m;
V<int> seq;
for(int i=1;i<=m;i++){
int num;
cin>>num;
seq.pb(num);
}
bool flag=1;
set<int> s;
set<int>ones;
for(int i=1;i<seq.size();i++){
if(dep[seq[i]]<dep[seq[i-1]]){
cout<<"No\n";
flag=0;
break;
}
if(dep[seq[i]]>dep[seq[i-1]]) continue;
int l = lca(seq[i],seq[i-1]);
int a,b;
a = getfa(l,seq[i-1]);
b = getfa(l,seq[i]);
f[a].insert(b);
ind[b]=1;
ones.insert(b);
s.insert(a);
}
if(flag==0){
for(auto i:s) f[i].clear();
for(auto i:ones) ind[i]=0;
continue;
}
for(auto i:s){
if(ind[i]==1) continue;
vis.clear();
vis[i]=1;
queue<int> q;
q.push(i);
V<int> vv;
while(!q.empty()){
int x = q.front();
vv.pb(x);
q.pop();
for(auto j:f[x]){
if(vis[j]==1){
flag=0;
cout<<"No\n";
break;
}
vis[j]=1;
q.push(j);
}
if(flag==0) break;
}
for(auto i:vv) vis[i]=0;
if(flag==0) break;
}
if(flag==0){
for(auto i:s) f[i].clear();
for(auto i:ones) ind[i]=0;
continue;
}
for(auto i:s) f[i].clear();
for(auto i:ones) ind[i]=0;
cout<<"Yes\n";
}
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
solve();
}
Details
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Test #1:
score: 100
Accepted
time: 3ms
memory: 28228kb
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: 215ms
memory: 78384kb
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 Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes ...
result:
wrong answer expected NO, found YES [1st token]