제출 #659473

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
659473		Lobo	Star Trek (CEOI20_startrek)	C++17	0 / 100	10 ms	12116 KiB

startrek

    #include<bits/stdc++.h>
    using namespace std;
    const long long inf = (long long) 1e18 + 10;
    const int inf1 = (int) 1e9 + 10;
    #define int long long
    #define dbl long double
    #define endl '\n'
    #define sc second
    #define fr first
    #define mp make_pair
    #define pb push_back
    #define all(x) x.begin(), x.end()

    const int maxn = 5e5+10;
    const int mod = 1e9+7;

    int n, d;
    vector<pair<int,int>> g[maxn];
    void solve() {
        cin >> n >> d;

        for(int i = 1; i <= n-1; i++) {
            int u,v; cin >> u >> v;
            int idu = g[u].size();
            int idv = g[v].size();
            g[u].pb(mp(v,idv));
            g[v].pb(mp(u,idu));
        }
        int ans = 1;
        for(int i = 1; i <= d+1; i++) {
            ans = ans*2%mod;
        }
        cout << ans << endl;
        

    }

    int32_t main() {
        ios::sync_with_stdio(false); cin.tie(0);

        // freopen("in.in", "r", stdin);
        // freopen("out.out", "w", stdout);
        int tt = 1;
        // cin >> tt;
        while(tt--) {
            solve();
        }

    }

• 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