Submission #649478

#	Time	Username	Problem	Language	Result	Execution time	Memory
649478		ymm	Rack (eJOI19_rack)	C++17	100 / 100	5 ms	304 KiB

rack

#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (ll)(r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (ll)(l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

int main()
{
	ll n, k;
	cin >> n >> k; --k;
	const int mod = 1e9+7;
	ll ans = 0;
	Loop (_,0,n) {
		ans = (ans*2 + k%2) % mod;
		k /= 2;
	}
	cout << (ans+1)%mod << '\n';
}

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