Submission #703055

#	Time	Username	Problem	Language	Result	Execution time	Memory
703055		rainboy	Odd-even (IZhO11_oddeven)	C11	100 / 100	6 ms	292 KiB

oddeven

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

#define N	111
#define D	10

int main() {
	static char cc[N + 1];
	static int aa[N * 2], bb[N * 2], tt[N * 2];
	int n, h, i, j, r, k;

	scanf("%s", cc), n = strlen(cc);
	for (i = 0; i < n; i++)
		aa[i] = cc[n - 1 - i] - '0';
	for (h = N - 1; h >= 0; h--) {
		for (bb[h] = 1; bb[h] < D; bb[h]++) {
			memset(tt, 0, N * 2 * sizeof *tt);
			for (i = 0; i < N; i++)
				for (j = 0; j < N; j++)
					tt[i + j] += bb[i] * bb[j];
			for (i = 0; i < N; i++)
				tt[i] += bb[i];
			for (i = 0; i < N * 2; i++)
				if (tt[i] >= D)
					tt[i + 1] += tt[i] / D, tt[i] %= D;
			r = 0;
			for (i = N * 2 - 1; i >= 0; i--) {
				r = r * D + tt[i];
				tt[i] = r / 2, r %= 2;
			}
			for (i = N * 2 - 1; i >= 0; i--)
				if (tt[i] != aa[i]) {
					if (tt[i] > aa[i])
						goto out;
					break;
				}
			if (i < 0)
				goto out;
		}
out:
		bb[h]--;
	}
	for (i = 0; i < N; i++)
		aa[i] *= 2;
	for (i = 0; i < N; i++)
		if (aa[i] >= D)
			aa[i] -= D, aa[i + 1]++;
	for (i = 0; i < N; i++)
		aa[i] -= bb[i];
	aa[0]--;
	for (i = 0; i < N; i++)
		if (aa[i] < 0) {
			k = (-aa[i] + 9) / D;
			aa[i] += k * D, aa[i + 1] -= k;
		}
	i = N - 1;
	while (aa[i] == 0)
		i--;
	while (i >= 0)
		printf("%d", aa[i--]);
	printf("\n");
	return 0;
}

Compilation message (stderr)

oddeven.c: In function 'main':
oddeven.c:12:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%s", cc), n = strlen(cc);
      |  ^~~~~~~~~~~~~~~

• Subtask 1: 100 / 100