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

int *board;
int target;

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

void print_board()
{
    int i = 0;
    while (i < target)
    {
        if (i == 0)
            fprintf(stdout, "%i", board[i]);
        else
            fprintf(stdout, " %i", board[i]);
        i++;
    }
    fprintf(stdout,"\n");
}

int is_safe(int row, int col)
{
    int c = 0;
    while (c < col)
    {
        if (board[c] == row)
            return (0);
        if (ft_abs(board[c] - row) == ft_abs(col -c))
            return (0);
        c++;
    }
    return (1);
}

void solve(int col)
{
    if (col == target)
        return (print_board());

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

int main(int ac, char **av)
{
    if (ac != 2)
        return (1);
    target = atoi(av[1]);
    board = (int *)calloc(target, sizeof(int));
    solve(0);
    free(board);
    return (0);
}