Submission #1265909

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265909		rutra454	Rack (eJOI19_rack)	C++20	100 / 100	98 ms	436 KiB

rack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll pot(ll dl){
    ll wyn = 1;
    for(int i = 1; i < dl; ++i){
        wyn *= 2;
        wyn %= 1000000007;
    }
    return wyn;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll n,k;
    cin >> n >> k;
    ll pocz = 1, dl = n;
    for(int i = 0; i < n; ++i){
        //cout << pocz << ' ' << dl << ';' << k << '\n';
        if(k % 2 == 0){
            pocz += pot(dl);
            pocz %= 1000000007;
            dl--;
        }
        else{
            dl--;
        }
        k = k/2 + k%2;
    }
    cout << pocz % 1000000007;
}

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