Submission #791609

#	Time	Username	Problem	Language	Result	Execution time	Memory
791609		PoonYaPat	Star Trek (CEOI20_startrek)	C++14	7 / 100	1 ms	2704 KiB

startrek

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

int n;
bool win[100005][2][2],W[100005][2];
int cnt[100005][2];
vector<int> adj[100005];
ll d;
const ll mod=1e9+7;

ll power(ll a, ll h) {
    ll res=1;
    while (h) {
        if (h%2==1) res=(res*a)%mod;
        a=(a*a)%mod;
        h/=2;
    }
    return res;
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>n>>d;
    for (int i=0; i<n-1; ++i) {
        int a,b; cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }

    cout<<power(4,d);
}

• 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