제출 #1260458

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1260458		mingga	Rack (eJOI19_rack)	C++20	40 / 100	1 ms	328 KiB

rack

// Author: caption_mingle
#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define int long long
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 1e6 + 7;
int n, k, p[N];

int add(int x, int y) {
	x += y;
	if(x >= mod) x -= mod;
	return x;
}

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	#define task ""
	if(fopen(task ".INP", "r")) {
		freopen(task ".INP", "r", stdin);
		freopen(task ".OUT", "w", stdout);
	}
	cin >> n >> k;
	p[0] = 1;
	for(int i = 1; i <= n; i++) p[i] = add(p[i - 1], p[i - 1]);
	int st = 1;
	if(n - 1 <= 62 and (1ll << (n - 1)) < k) {
		k -= (1ll << (n - 1));
		st = 2;
	}
	if(k == 1) {
		cout << st;
		return 0;
	}
	k--;
	for(int i = 0; (1 << i) <= k; i++) {
		if(k >> i & 1) {
			st = add(st, p[n - i - 1]);
		}
	}
	cout << st << ln;
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

컴파일 시 표준 에러 (stderr) 메시지

rack.cpp: In function 'int main()':
rack.cpp:28:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
rack.cpp:29:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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