#include "powerset.h"

void	print_subset(int *subset, int size)
{
	int	i;

	i = 0;
	while (i < size)
	{
		printf("%d", subset[i]);
		if (i < size - 1)
			printf(" ");
		i++;
	}
	printf("\n");
}

void	find_subsets(int *set, int set_size, int target, int *subset,
		int subset_size, int index)
{
	int	current_sum;
	int	i;

	if (index == set_size)
	{
		current_sum = 0;
		i = 0;
		while (i < subset_size)
		{
			current_sum += subset[i];
			i++;
		}
		if (current_sum == target)
			print_subset(subset, subset_size);
		return ;
	}
	find_subsets(set, set_size, target, subset, subset_size, index + 1);
	subset[subset_size] = set[index];
	find_subsets(set, set_size, target, subset, subset_size + 1, index + 1);
}

int	main(int argc, char **argv)
{
	int	*set;
	int	*subset;
	int	target;
	int	set_size;
	int	i;

	if (argc < 2)
		return (1);
	target = atoi(argv[1]);
	set_size = argc - 2;
	set = malloc(sizeof(int) * set_size);
	if (!set)
		return (1);
	subset = malloc(sizeof(int) * set_size);
	if (!subset)
	{
		free(set);
		return (1);
	}
	i = 0;
	while (i < set_size)
	{
		set[i] = atoi(argv[i + 2]);
		i++;
	}
	find_subsets(set, set_size, target, subset, 0, 0);
	free(set);
	free(subset);
	return (0);
}