Submission #533300

#	Time	Username	Problem	Language	Result	Execution time	Memory
533300		stasico	Rack (eJOI19_rack)	C++17	100 / 100	10 ms	316 KiB

rack

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

  const int Mod=1e9+7;

int main()
{
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n,i,w=1,p=1;
	long long k;
	cin >> n >> k; --k;
	for (i=1; i<=n; i++)
   {
		if (k%2==0) w=((long long)2*w)%Mod;
		  else w=((long long)2*w+1)%Mod;
		k=k/2;
	 }
	for (i=1; i<=n; i++) p=((long long)2*p)%Mod;
	cout << (w-(p-1)+Mod)%Mod << endl;
}

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