Eight Queen Problem/햇병아리

~cpp 
char board[8][8] = {
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0},
	{1, 0, 0, 0, 0, 0, 0, 0}
};
char queens[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

void increase()
{
	register int i, j;

	i = 7;
	for (i = 7; i >= 0; i--) {
		j = queens[i];
		board[i][j] = 0;
		j = queens[i] = (j + 1) % 8;
		board[i][j] = 1;
		if (j)
			break;
	}
}

int check_line()
{
	register int i, j;
	register int count;

	for (i = 0; i < 8; i++) {
		for (count = 0, j = 0; j < 8; j++) {
			if (board[j][i]) {
				if (count)
					return 1;
				count = 1;
			}
		}
		if (! count)
			return 1;
	}
	return 0;
}

int check_diagonal()
{
	register int count;
	register int i, j, k;

	for (i = 0, j = 0; j <= 6; j++) {
		for (count = 0, k = 0; k < 8-j; k++) {
			if (board[i+k][j+k]) {
				if (count)
					return 1;
				count = 1;
			}
		}
	}
	for (i = 1, j = 0; i <= 6; i++) {
		for (count = 0, k = 0; k < 8-i; k++) {
			if (board[i+k][j+k]) {
				if (count)
					return 1;
				count = 1;
			}
		}
	}
	for (i = 0, j = 1; j <= 7; j++) {
		for (count = 0, k = 0; k < j+1; k++) {
			if (board[i+k][j-k]) {
				if (count)
					return 1;
				count = 1;
			}
		}
	}
	for (i = 1, j = 7; i <= 6; i++) {
		for (count = 0, k = 0; k < 8-i; k++) {
			if (board[i+k][j-k]) {
				if (count)
					return 1;
				count = 1;
			}
		}
	}
	return 0;
}

int main()
{
	int i, j;

	for (;; increase()) {
		if (check_line())
			continue;
		else if (check_diagonal())
			continue;
		break;
	}

	for (i = 0; i < 8; i++) {
		for (j = 0; j < 8; j++) {
			printf("%d ", board[i][j]);
		}
		printf("\n");
	}

	return 0;
}