Submission #1090907

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090907		Muhammet	Rack (eJOI19_rack)	C++17	100 / 100	100 ms	604 KiB

rack

#include <bits/stdc++.h>

using namespace std;

const long long M = (1e9 + 7);

long long n, k, ans;

void f(long long x, long long l, int y){
	if(y == -1){
		ans = l;
		return;
	}
	if(x % 2 == 0){
		long long z = 1;
		for(int i = 0; i < y; i++){
			z *= 2;
			z %= M;
		}
		l += z;
		l %= M;
	}
	if(x >= 2) x++, x /= 2;
	f(x,l,y-1);
}

int main(){
	cin >> n >> k;
	f(k,1,n-1);
	ans %= M;
	cout << ans;
}

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