Submission #672150

#	Time	Username	Problem	Language	Result	Execution time	Memory
672150		Stavab	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	300 KiB

rack

#include <iostream>

using namespace std;

int pow(int n)
{
    long long t = 1;
    for(int i = 1; i <= n; i++)
    {
        t *= 2;
        t %= 1000000007;
    }
    return t;
}

int main()
{
    int n, k;
    cin >> n >> k;
    
    k = k - 1;
    long long ans = 0;
    for(int i = 1; i <= n; i++)
    {
        if(k % 2 == 1)
        {
            ans += pow(n - i);
            ans %= 1000000007;
        }
        
        k /= 2;
    }
    
    ans = ans + 1;
    ans %= 1000000007;
    
    cout << ans << '\n';
    
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60