Submission #940858

#	Time	Username	Problem	Language	Result	Execution time	Memory
940858		rainboy	팩토리얼 세제곱들의 합 (YDX14_fact)	C11	1 / 1	1 ms	852 KiB

fact

#include <stdio.h>

#define M	40
#define B	1000000000000

int power(int a, int k) {
	return k == 0 ? 1 : power(a, k - 1) * a;
}

int main() {
	static long long aa[M], ss[M];
	int n, k, h, i, x;

	scanf("%d%d", &n, &k);
	aa[0] = ss[0] = 1;
	for (i = 1; i <= n; i++) {
		x = power(i, k);
		for (h = 0; h < M; h++)
			aa[h] *= x;
		for (h = 0; h + 1 < M; h++)
			aa[h + 1] += aa[h] / B, aa[h] %= B;
		if (aa[M - 1] >= B) {
			printf("bad\n");
			return 0;
		}
		for (h = 0; h < M; h++)
			ss[h] += aa[h];
		for (h = 0; h + 1 < M; h++)
			ss[h + 1] += ss[h] / B, ss[h] %= B;
		if (ss[M - 1] >= B) {
			printf("bad\n");
			return 0;
		}
	}
	h = 0;
	while (ss[h] == 0)
		h++;
	while (ss[h] % 10 == 0)
		ss[h] /= 10;
	printf("%lld\n", ss[h] % 10);
	return 0;
}

Compilation message (stderr)

fact.c: In function 'main':
fact.c:14:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  scanf("%d%d", &n, &k);
      |  ^~~~~~~~~~~~~~~~~~~~~

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