제출 #559027

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
559027		Stickfish	Star Trek (CEOI20_startrek)	C++17	0 / 100	2 ms	2644 KiB

startrek

#include <iostream>
#include <vector>
using namespace std;
using ll = long long;

const int MAXN = 1e5 + 123;
const ll MOD = 1000000007;
vector<int> edg[MAXN];

ll pw(ll a, ll m) {
    if (!m)
        return 1;
    a %= MOD;
    if (m % 2)
        return pw(a, m - 1) * a % MOD;
    return pw(a * a, m >> 1);
}

signed main() {
    ll n, d;
    cin >> n >> d;
    for (int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        --u, --v;
        edg[u].push_back(v);
        edg[v].push_back(u);
    }
    if (n == 2) {
        cout << pw(2, d) << endl;
        return 0;
    }
}

• 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