#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

void ft_putchar(char c)
{
	write(1, &c, 1);
}

void ft_putnbr(int n)
{
	if (n >= 10)
		ft_putnbr(n / 10);
	ft_putchar((n % 10) + '0');
}

void print_solution(int *board, int n)
{
	int i = 0;
	while (i < n)
	{
		ft_putnbr(board[i]);
		if (i < n - 1)
			ft_putchar(' ');
		i++;
	}
	ft_putchar('\n');
}

int	ft_abs(int nbr)
{
	if (nbr < 0)
		return (nbr * -1);
	else
		return (nbr);
}

int is_safe(int *board, int n, int row, int col)
{
	int i;

	i = 0;
	(void)n;
	while (i < col)
	{
		if (board[i] == row)
			return (0);
		if (ft_abs(board[i] - row) == (col - i))
			return (0);
		i++;
	}
	return (1);
}

void solve(int *board, int n, int col)
{
	if (col == n)
		return(print_solution(board, n));

	int row = 0;
	while (row < n)
	{
		if (is_safe(board, n, row, col))
		{
			board[col] = row;
			solve(board, n, col + 1);
		}
		row++;
	}
}

int main(int argc, char **argv)
{
	int *board;
	int n;

	if (argc != 2)
		return (fprintf(stderr, "Usage: %s n\n", argv[0]), 1);

	n = atoi(argv[1]);
	if (n <= 0)
		return (0); 
	
	board = (int *)malloc(sizeof(int) * n);
	if (!board)
	{
		fprintf(stderr, "Memory allocation failed\n");
		return (1);
	}
	solve(board, n, 0);
	free(board);
	return (0);
}