제출 #476233

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
476233		rainboy	Strah (COCI18_strah)	C11	110 / 110	317 ms	66800 KiB

strah

#include <stdio.h>
#include <string.h>

#define N	2000
#define M	2000

int main() {
	static char cc[N][M + 1];
	static int kk[N][M], pp[N][M], qq[N][M], hh[N * M], cnt[M + 2];
	int n, m, h, i, j, k;
	long long ans, x;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		scanf("%s", cc[i]);
	for (i = 0; i < n; i++)
		for (j = m - 1, k = 0; j >= 0; j--)
			kk[i][j] = k = cc[i][j] == '#' ? 0 : k + 1;
	memset(cnt, 0, (m + 2) * sizeof *cnt);
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			cnt[kk[i][j] + 1]++;
	for (k = 1; k <= m + 1; k++)
		cnt[k] += cnt[k - 1];
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			hh[cnt[kk[i][j]]++] = i * m + j;
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			pp[i][j] = i - 1, qq[i][j] = i + 1;
	x = 0;
	ans = 0;
	for (k = m, h = n * m - 1; k >= 1; k--) {
		while (h >= 0 && kk[hh[h] / m][hh[h] % m] == k) {
			int p, q;

			i = hh[h] / m, j = hh[h] % m, p = pp[i][j], q = qq[i][j];
			x -= (long long) (i - p + 1) * (i - p) * (i - p - 1) / 6;
			x -= (long long) (q - i + 1) * (q - i) * (q - i - 1) / 6;
			x += (long long) (q - p + 1) * (q - p) * (q - p - 1) / 6;
			if (p != -1)
				qq[p][j] = q;
			if (q != n)
				pp[q][j] = p;
			h--;
		}
		ans += x * k;
	}
	printf("%lld\n", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

strah.c: In function 'main':
strah.c:13:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
strah.c:15:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   scanf("%s", cc[i]);
      |   ^~~~~~~~~~~~~~~~~~

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