Submission #761541

#	Time	Username	Problem	Language	Result	Execution time	Memory
761541		Maca	Rack (eJOI19_rack)	C++17	100 / 100	10 ms	7892 KiB

rack

#include <bits/stdc++.h>
using namespace std;

const long long d = 1e9+7;

vector <long long> t;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    long long n,k,w=1;

    cin>>n>>k;
    t.resize(n);
    t[0]=1;
    for (int i=1; i<n; i++)
        t[i]=(t[i-1]*2)%d;
    
    for (int i=n-1; i>=0; i--)
    {
        if (k%2==0)
        {
            w+=t[i];
            w=w%d;
        }
        else
        {
            k++;
        }
        k/=2;
    }
    cout<<w;
}

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