제출 #503217

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
503217		rainboy	Magneti (COCI21_magneti)	C11	0 / 110	1 ms	276 KiB

Main

#include <stdio.h>

#define N	50
#define MD	1000000007

int vv[N + 1], ff[N + 1], gg[N + 1];

void init() {
	int i;

	ff[0] = gg[0] = 1;
	for (i = 1; i <= N; i++) {
		vv[i] = i == 1 ? 1 : (long long) vv[i - MD % i] * (MD / i + 1) % MD;
		ff[i] = (long long) ff[i - 1] * i % MD;
		gg[i] = (long long) gg[i - 1] * vv[i] % MD;
	}
}

int choose(int n, int k) {
	return k < 0 || k > n ? 0 : (long long) ff[n] * gg[k] % MD * gg[n - k] % MD;
}

int main() {
	static int rr[N];
	int n, l, i;

	init();
	scanf("%d%d", &n, &l);
	for (i = 0; i < n; i++)
		scanf("%d", &rr[i]);
	printf("%lld\n", (long long) choose(l - (rr[0] - 1) * (n - 1), n) * ff[n] % MD);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.c: In function 'main':
Main.c:28:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |  scanf("%d%d", &n, &l);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:30:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   scanf("%d", &rr[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 50