Submission #479410

#	Time	Username	Problem	Language	Result	Execution time	Memory
479410		rainboy	Mobitel (COCI19_mobitel)	C11	26 / 130	171 ms	1168 KiB

mobitel

#include <stdio.h>

#define N	300
#define M	300
#define A	300
#define MD	1000000007

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

void init() {
	int i;

	ff[0] = gg[0] = 1;
	for (i = 1; i < N + M; 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 (long long) ff[n] * gg[k] % MD * gg[n - k] % MD;
}

int main() {
	static int aa[N][M], dp[M][A];
	int n, m, c, i, j, a, b, ans;

	init();
	scanf("%d%d%d", &n, &m, &c);
	if (c > A) {
		printf("0\n");
		return 0;
	}
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			scanf("%d", &aa[i][j]);
	if (aa[0][0] < c)
		dp[0][aa[0][0]] = 1;
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++) {
			if (i == 0 && j == 0)
				continue;
			a = aa[i][j];
			for (b = c - 1; b >= 1; b--)
				dp[j][b] = b % a != 0 ? 0 : ((i == 0 ? 0 : dp[j][b / a]) + (j == 0 ? 0 : dp[j - 1][b / a])) % MD;
		}
	ans = 0;
	for (b = 1; b < c; b++)
		ans = (ans + dp[m - 1][b]) % MD;
	ans = (choose(n - 1 + m - 1, n - 1) - ans + MD) % MD;
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

mobitel.c: In function 'main':
mobitel.c:30:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |  scanf("%d%d%d", &n, &m, &c);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
mobitel.c:37:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |    scanf("%d", &aa[i][j]);
      |    ^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 26 / 130