QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#469091 | #8720. BFS 序 0 | JEdward | WA | 238ms | 72344kb | C++17 | 1.9kb | 2024-07-09 13:38:49 | 2024-07-09 13:38:52 |
Judging History
answer
#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(0), cin.tie(0)
#define int long long
#define endl '\n'
#define lowbit(x) (x)&(-x)
#define pii pair<int,int>
#define all(s) s.begin(), s.end()
#define ls(x) (x<<1)
#define rs(x) (x<<1|1)
#define here system("pause")
using namespace std;
const int N = 3e5+5;
const int mod = 1e9+7;
const int INF = 1e15+7;
const double eps = 1e-6;
inline int pow(int a, int b, int p){ int res = 1%p; while(b){ if(b&1) res=res*a%p; a=a*a%p, b>>=1;} return res;}
inline int inv(int a, int p){ return pow(a,p-2,p)%p;}
int n, q;
vector<int> pd[N];
int f[N][20], dep[N], ask[N<<1], indeg[N];
inline void sol(){
cin >> n;
for(int i=2;i<=n;i++){
cin >> f[i][0];
}
for(int i=1;i<=n;i++){
dep[i]=dep[f[i][0]]+1;
}
for(int i=1;i<20;i++){
for(int j=1;j<=n;j++){
f[i][j]=f[i-1][f[i-1][j]];
}
}
cin >> q;
while(q--){
int num;
cin >> num;
bool flag = 1;
for(int i=1;i<=num;i++){
cin >> ask[i];
if(i!=1 && ask[i-1]==ask[i]) flag = 0;
if(i!=1 && dep[ask[i]] < dep[ask[i-1]]) flag = 0;
}
if(!flag){
cout << "No\n";
continue;
}
set<int> st;
for(int i=2;i<=num;i++){
if(dep[ask[i-1]]==dep[ask[i]]){
int a = ask[i-1], b = ask[i];
for(int j=19;j>=0;j--){
if(f[j][a] != f[j][b]) a = f[j][a], b = f[j][b];
}
st.insert(a), st.insert(b);
pd[a].push_back(b);
++indeg[b];
}
}
queue<int> q;
for(int k:st){
if(!indeg[k]) q.push(k);
}
while(q.size()){
int now = q.front();
q.pop();
for(int k:pd[now]){
--indeg[k];
if(!indeg[k]) q.push(k);
}
}
for(int k:st){
if(indeg[k]) flag = 0;
}
if(!flag) cout << "No\n";
else cout << "Yes\n";
for(int k:st){
indeg[k] = 0;
pd[k].clear();
}
}
}
signed main(){
IOS;
int tc = 1;
while(tc--){
sol();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 4ms
memory: 14892kb
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: 238ms
memory: 72344kb
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]