Submission #763722

#	Time	Username	Problem	Language	Result	Execution time	Memory
763722		Gabi88	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	268 KiB

rack

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

#define LL long long

LL n, k, poc = 0, kraj = 1;

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cin >> n >> k;
	for(int i=0; i<n; i++){ kraj *= 2; kraj %= 1000000007; }
	while(k > 1){
		LL mid = (poc + kraj) / 2;
		if (k % 2 == 0) poc = mid;
		else kraj = mid;
		k = (k+1) / 2; poc %= 1000000007;
	}
	cout << (poc+1) % 1000000007; return 0;
}

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