제출 #642627

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
642627		NewChapter	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	212 KiB

rack

#include <bits/stdc++.h>
 
using namespace std;
 
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define pii pair<int, int>
#define vi vector<int>
#define forn(i, s, n) for(int i = s; i < n; ++i)
#define forj(j, s, n) for(int j = s; j < n; ++j)
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
 
const char* fileNameIn = "main.in";
const char* fileNameOut = "main.out";
#define files() freopen(fileNameIn, "r", stdin); freopen(fileNameOut, "w", stdout)
 
const int N = 1e6;
const int M = N + 7;
const int INF = 1e9;
typedef long long ll;

bool a[N + 5];

ll binpow(ll base, ll power) {
	if(power == 1) {
		return base;
	}
	if(power == 0) {
		return 1;
	}
	if(power % 2 == 0) {
		ll tmp = binpow(base, power >> 1);
		return tmp * tmp % M;
	}
	else {
		ll tmp = binpow(base, (power - 1) >> 1);
		return tmp * tmp % M * base % M;
	}
}

int main() {
	fast_io;
	int n;
	ll k;
	ll ans = 0;
	cin >> n >> k;
	k -= 1;
	int j = n - 1;
	while(k) {
		a[j--] = k % 2;
		k /= 2;
	}
	for(int i = 0; i < n; ++i) {
		if(a[i])
			ans = (ans + binpow(2, i)) % M;
	}
	ans += 1;
	ans %= M;
	cout << ans;
}

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