Submission #1090223

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090223		pmqwerty	Magic Tree (CEOI19_magictree)	C++17	0 / 100	27 ms	13224 KiB

magictree

#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 100;
vector<int> a[MAXN];
int par[MAXN];
int indegree[MAXN];
int outdegree[MAXN];
int n, m, k;
pair<int, int> f[MAXN];
namespace sub2{
    bool check(){
        for (int i = 1; i <= m; i++){
             if (outdegree[f[i].second] == 0){
                 return false;
             }
        }
        return true;
    }
    void solve(){
        cout << m << '\n';
    }
}
namespace sub1{
    bool check(){
        return n <= 20 && k <= 20;
    }
    void solve(){
        for (int i = 1; i <= n; i++){

        }
    }
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m >> k;
    for (int i = 2; i <= n; i++){
         int x;
         cin >> x;
         a[x].push_back(i);
         outdegree[x]++;
         indegree[x]++;
    }
    for (int i = 1; i <= m; i++){
         cin >> f[i].first >> f[i].second;
    }
    if (sub2::check()) sub2::solve();
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 3
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 16
• Subtask 6: 0 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17