제출 #432876

#제출 시각아이디문제언어결과실행 시간메모리
432876rainboyArchery (IOI09_archery)C11
19 / 100
2071 ms308 KiB
#include <stdio.h>
#include <string.h>

#define N	200000

int main() {
	static int aa[N * 2], bb[N * 2], pp[N * 2];
	static char used[N];
	int n, r, p, p_, i, i_, a;

	scanf("%d%d", &n, &r);
	if (n > 200) {
		printf(":(\n");
		return 0;
	}
	for (i = 0; i < n * 2; i++)
		scanf("%d", &aa[i]), aa[i]--;
	i_ = -1, p_ = n * 2;
	for (i = 0; i < n * 2; i++) {
		int tmp;

		if (i > 0)
			tmp = aa[i], aa[i] = aa[i - 1], aa[i - 1] = tmp;
		memcpy(bb, aa, n * 2 * sizeof *aa);
		for (p = 0; p < n * 2; p++)
			pp[aa[p]] = p / 2;
		if (aa[i] == 0)
			p = 0;
		else if (aa[i] >= n + 1) {
			memset(used, 0, n * sizeof *used), used[0] = 1;
			for (a = n * 2 - 1; a >= aa[i]; a--) {
				p = pp[a];
				while (used[p])
					p = (p - 1 + n) % n;
				used[p] = 1;
			}
		} else {
			memset(used, 0, n * sizeof *used);
			for (a = 0; a <= aa[i]; a++) {
				p = pp[a];
				while (used[p])
					p = (p + 1) % n;
				used[p] = 1;
			}
			p = (p - r % n + n) % n;
		}
		if (p_ >= p)
			p_ = p, i_ = i / 2;
	}
	printf("%d\n", i_ + 1);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

archery.c: In function 'main':
archery.c:11:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  scanf("%d%d", &n, &r);
      |  ^~~~~~~~~~~~~~~~~~~~~
archery.c:17:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   scanf("%d", &aa[i]), aa[i]--;
      |   ^~~~~~~~~~~~~~~~~~~
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