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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* sorting.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dkaiser <dkaiser@student.42heilbronn.de +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/04/13 15:04:19 by dkaiser #+# #+# */
/* Updated: 2024/04/17 12:20:26 by dkaiser ### ########.fr */
/* */
/* ************************************************************************** */
#include "push_swap.h"
static void presort(t_psdata *data)
{
int size;
int pivot;
int max;
size = data->a->size;
pivot = size / 2;
max = data->a->stack[0];
while (size--)
{
if (data->a->stack[0] < max)
{
run_command(data, PB);
if (data->b->stack[0] > pivot)
run_command(data, RB);
}
else
{
max = data->a->stack[0];
run_command(data, RA);
}
}
}
static int calculate_score(t_psdata *data, int pos)
{
int moves_to_top;
int moves_to_spot;
int i;
if (pos < (data->b->size + 1) / 2)
moves_to_top = pos;
else
moves_to_top = data->b->size - pos;
i = 0;
while (i < data->a->size && data->a->stack[i] < data->b->stack[pos])
i++;
if (i < (data->a->size + 1) / 2)
moves_to_spot = 2 * i + 1;
else
moves_to_spot = 2 * ((data->a->size - i) + 1);
return moves_to_top + moves_to_spot;
}
static void move_to_top(t_psdata *data, int idx)
{
if (idx < (data->b->size + 1) / 2)
{
while (idx--)
run_command(data, RB);
}
else
{
idx = data->b->size - idx;
while (idx--)
run_command(data, RRB);
}
}
static void move_to_spot(t_psdata *data)
{
int pos;
int i;
pos = 0;
while (pos < data->a->size && data->b->stack[0] < data->a->stack[pos])
pos++;
if (pos < (data->a->size + 1) / 2)
{
i = pos;
while (i--)
run_command(data, RA);
run_command(data, PA);
i = pos;
while (i--)
run_command(data, RRA);
}
else
{
i = data->a->size - pos;
while (i--)
run_command(data, RRA);
run_command(data, PA);
i = data->a->size - pos;
while (i--)
run_command(data, RA);
}
}
static void scoresort(t_psdata *data)
{
int *scores;
int i;
int min_score;
scores = malloc(sizeof(int) * data->b->size);
// Error if allocation fails
i = 0;
while (i < data->b->size)
{
scores[i] = calculate_score(data, i);
i++;
}
i = 0;
min_score = 0;
while (i < data->b->size)
{
if (scores[i] < scores[min_score])
min_score = i;
i++;
}
move_to_top(data, min_score);
move_to_spot(data);
free(scores);
if (data->b->size > 0)
scoresort(data);
}
void stack_sort(t_psdata *data)
{
presort(data);
scoresort(data);
}
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