Submission #559865

#	Time	Username	Problem	Language	Result	Execution time	Memory
559865		Stavab	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	212 KiB

rack

#include <bits/stdc++.h>

using namespace std;

const int mod = 1000000007;
long long i, j, k;

void narrow (int lower, int 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 = 1;
    for (int a = 1; a <= n; a++)
    {
        j = (j * 2) % mod;
    }

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

    cout << i;
    return 0;
}

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