Submission #1233074

#	Time	Username	Problem	Language	Result	Execution time	Memory
1233074		LaMatematica14	Star Trek (CEOI20_startrek)	C++20	7 / 100	0 ms	328 KiB

startrek

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

const long long mod = 1000000007;

long long fe(long long e) {
    long long att = 4, ris = 1;
    for (long long i = 1; i < e && i > 0; i<<=1) {
        if (i&e) ris *= att;
        ris %= mod;
        att *= att; att %= mod;
    }
    return ris;
}

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);
    }

    cout << fe(D) << "\n";
}

• Subtask 1: 0 / 0
• Subtask 2: 7 / 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