제출 #607280

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
607280		xtk	Rack (eJOI19_rack)	C++17	40 / 100	1 ms	212 KiB

rack

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
// #define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
const int MOD=1e9+7;
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n;
	long long k;
	cin>>n>>k;
	k--;
	int ans=1;
	for (int i=1; i<=n; ++i) {
		if(k%2==1) {
			ans = ((long long)(ans*2+1))%MOD;
		}
		else {
			ans = ((long long)(ans*2))%MOD;
		}
		k/=2;
	}
	int pow=1;
	for (int i=1; i<=n; ++i) {
		pow = ((long long)pow*2)%MOD;
	}
	cout<<(ans-(pow-1))%MOD<<'\n';
}

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