Submission #534932

#	Time	Username	Problem	Language	Result	Execution time	Memory
534932		vector	Star Trek (CEOI20_startrek)	C++17	7 / 100	3 ms	2640 KiB

startrek

#include<bits/stdc++.h>
#define MOD 1000000007
#define SIZE 100010
using namespace std;
typedef long long ll;
ll N,D;
vector<ll>con[SIZE];
ll F(ll x,ll y)
{
    if(y==0)return 1;
    if(y==1)return x;
    ll ret=F(x,y/2);
    ret=(ret*ret)%MOD;
    if(y%2)ret=(ret*x)%MOD;
    return ret;
}
int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    cin>>N>>D;
    for(int i=1;i<N;i++){
        ll s,e;cin>>s>>e;
        con[s].push_back(e);
        con[e].push_back(s);
    }
    printf("%lld",F(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