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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#424476 | #8720. BFS 序 0 | _mjj | WA | 88ms | 32064kb | C++20 | 2.2kb | 2024-05-29 11:06:55 | 2024-05-29 11:06:56 |
Judging History
answer
#include <bits/stdc++.h>
#define x first
#define y second
#define all(v) v.begin() , v.end()
#define ios ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
#define int long long
using namespace std;
typedef long long LL;
typedef pair<int , int> PII;
const int N = 3e5 + 5;
const int mod = 998244353;
const int INF = 0x3f3f3f3f;
vector<int> q[N];
int d[N];
vector<int> e[N];
int in[N];
void dfs(int u , int fa){
d[u] = d[fa] + 1;
for(auto c : q[u]){
if(c == fa)continue;
dfs(c , u);
}
}
void solve(){
int n;
cin >> n;
for(int i = 1 ; i < n ; i ++){
int x;
cin >> x;
q[x].push_back(i + 1);
}
dfs(1 , 0);
int q;
cin >> q;
while(q --){
int m;
cin >> m;
vector<int> ss;
bool ok = 1;
for(int i = 1 ; i <= m ; i ++){
int x;
cin >> x;
ss.push_back(x);
}
int mx = 0;
for(auto c : ss){
if(d[c] < mx)ok = 0;
mx = max(mx , d[c]);
}
if(!ok){
cout << "No\n";
for(int i = 0 ; i < m ; i ++)e[ss[i]].clear() , in[ss[i]] = 0;
continue;
}
for(int i = 0 ; i < m ; i ++){
int j = i;
while(j + 1 < m && d[j + 1] == d[i])j ++;
for(int k = i ; k < j ; k ++){
e[ss[k]].push_back(ss[k + 1]);
in[ss[k + 1]] ++;
}
i = j;
}
queue<int> qq;
for(int i = 0 ; i < m ; i ++){
if(in[ss[i]] == 0)qq.push(ss[i]);
}
while(qq.size()){
auto t = qq.front();
qq.pop();
for(auto c : e[t]){
in[c] --;
if(in[c] == 0){
qq.push(c);
}
}
}
for(int i = 0 ; i < m ; i ++){
if(in[ss[i]])ok = 0;
}
if(!ok)cout << "No\n";
else cout << "Yes\n";
for(int i = 0 ; i < m ; i ++)e[ss[i]].clear() , in[ss[i]] = 0;
}
}
signed main(){
ios;
int T = 1;
// cin >> T;
while(T --){
solve();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3560kb
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: 88ms
memory: 32064kb
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 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 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes ...
result:
wrong answer expected NO, found YES [1st token]