Submission #548692

#	Time	Username	Problem	Language	Result	Execution time	Memory
548692		Stavab	Rack (eJOI19_rack)	C++14	40 / 100	1081 ms	212 KiB

rack

#include <bits/stdc++.h>

using namespace std;

unsigned long long i, j, k;

void narrow (unsigned long long lower, unsigned long long upper)
{
    if (k % 2 == 0)
    {
        lower = (upper + lower) / 2 + 1;
        k /= 2;
    }
    else
    {
        upper = (upper + lower) / 2;
        k /= 2;
        k++;
    }
    
    i = lower;
    j = upper;
}

int main()
{
    int n;
    cin >> n >> k;

    i = 1;
    j = pow(2, n);

    while (j != i)
    {
        narrow(i, j);
    }

    cout << i % 1000000007;
    return 0;
}

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