Submission #643257

#	Time	Username	Problem	Language	Result	Execution time	Memory
643257		west	Rack (eJOI19_rack)	C++14	100 / 100	9 ms	300 KiB

rack

#include <iostream>

using namespace std;
const int m=1e9+7;
int main()
{
    int n;
    long long k;
    int wynik=1;
    cin>>n>>k;
    --k;
    for(int i=1;i<=n;i++)
    {
        if(k%2==0)
            wynik=((long long)2*wynik)%m;
            else
            wynik=((long long)2*wynik+1)%m;
            k=k/2;
    }
    int p=1;
        for(int i=1;i<=n;i++)
    p=((long long)2*p)%m;
    cout<<(wynik-(p-1)+m)%m;
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60