Submission #1233069

#	Time	Username	Problem	Language	Result	Execution time	Memory
1233069		LaMatematica14	Star Trek (CEOI20_startrek)	C++20	0 / 100	0 ms	328 KiB

startrek

#include <bits/stdc++.h>
using namespace std;

const long long mod = 1000000007;

int main() {
    long long N, D; cin >> N >> D;
    vector<vector<long long>> adj(N+1); // occhio 1-based
    for (long long  i = 0; i < N-1; i++) {
        long long u, v; cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    function<long long(int)> rec = [&](int a) -> long long{
        if (a == 1) return 2;
        return (rec(a-1)%mod)*2;
    };
    cout << rec(D) << "\n";
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 7
• Subtask 3: 0 / 8
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 15