Submission #476231

#	Time	Username	Problem	Language	Result	Execution time	Memory
476231		rainboy	Strah (COCI18_strah)	C11	66 / 110	1076 ms	70760 KiB

strah

#include <stdio.h>

#define N	2000
#define M	2000

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int kk[N][M], n, m;

void sort(int *hh, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, h = hh[l + rand_() % (r - l)], tmp;

		while (j < k) {
			int c = kk[hh[j] / m][hh[j] % m] - kk[h / m][h % m];

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = hh[i], hh[i] = hh[j], hh[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = hh[j], hh[j] = hh[k], hh[k] = tmp;
			}
		}
		sort(hh, l, i);
		l = k;
	}
}

int main() {
	static char cc[N][M + 1];
	static int hh[N * M], pp[N][M], qq[N][M];
	int 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;
	for (h = 0; h < n * m; h++)
		hh[h] = h;
	sort(hh, 0, n * m);
	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 != m)
				pp[q][j] = p;
			h--;
		}
		ans += x * k;
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

strah.c: In function 'main':
strah.c:42:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
strah.c:44:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |   scanf("%s", cc[i]);
      |   ^~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 11 / 11
• Subtask 7: 0 / 11
• Subtask 8: 11 / 11
• Subtask 9: 0 / 11
• Subtask 10: 0 / 11