Add inefficient quicksort? algorithm

This algorithm is based on quicksort but probably not really in its
spirit. It is extremely inefficient but could maybe fixed with some
post-optimization.

1 files changed, 42 insertions, 2 deletions

diff --git a/sorting.c b/sorting.c
index f04304f..b5668a9 100644
--- a/sorting.c
+++ b/sorting.c
@@ -6,14 +6,54 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/04/13 15:04:19 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/04/15 17:54:23 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/04/15 23:39:57 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft/ft_printf.h"
+#include "libft/libft.h"
 #include "push_swap.h"
 
+int is_sorted(t_stack *stack)
+{
+    int i;
+
+    if (stack->size < 2)
+        return 1;
+    i = 1;
+    while (i < stack->size)
+    {
+        if (stack->stack[i] < stack->stack[i-1])
+            return 0;
+        i++;
+    }
+    return 1;
+}
+
 
 t_list	*stack_sort(t_stack *stack_a, t_stack *stack_b)
 {
-    return NULL;
+    t_list *cmds = NULL;
+    int pivot;
+
+    int pivot_idx = stack_a->size - 1;
+    while (stack_b->size || !is_sorted(stack_a))
+    {
+        pivot = stack_a->stack[pivot_idx];
+
+        while (stack_a->size > 0 && stack_a->stack[0] != pivot)
+        {
+            if (stack_a->stack[0] > pivot)
+                run_command(stack_a, stack_b, &cmds, RA);
+            else
+                run_command(stack_a, stack_b, &cmds, PB);
+        }
+        while (stack_b->size > 0)
+            run_command(stack_a, stack_b, &cmds, PA);
+        if (stack_a->stack[pivot_idx] == pivot)
+            pivot_idx--;
+        if (pivot_idx < 0)
+            pivot_idx = stack_a->size - 1;
+    }
+    return cmds;
 }