From e2495fa62ff8789f6b7fc82403786b4f5619290c Mon Sep 17 00:00:00 2001
From: David Gailleton <dgaillet@z3r8p2.42lyon.fr>
Date: Mon, 15 Dec 2025 14:47:27 +0100
Subject: [PATCH] add three pre sort alg + optimized simple sort alg

---
 algorithms/insertion/insertion.c | 32 ++++++---------------
 algorithms/utils/iterate.c       |  6 ++--
 algorithms/utils/pre_sort.c      | 49 ++++++++++++++++++++++++++++++++
 push_swap.h                      |  4 ++-
 4 files changed, 64 insertions(+), 27 deletions(-)
 create mode 100644 algorithms/utils/pre_sort.c

diff --git a/algorithms/insertion/insertion.c b/algorithms/insertion/insertion.c
index f957c62..f5fe9ca 100644
--- a/algorithms/insertion/insertion.c
+++ b/algorithms/insertion/insertion.c
@@ -6,35 +6,12 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/12/10 15:38:52 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/12/14 17:31:02 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/12/15 14:45:54 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "push_swap.h"
 
-static int	r_to_lowest(t_stack *stack, int len)
-{
-	t_stack	*lowest;
-	int		lowest_i;
-	int		i;
-
-	i = 1;
-	lowest_i = 0;
-	lowest = stack;
-	stack = stack->next;
-	while (i < len)
-	{
-		if (stack->value < lowest->value)
-		{
-			lowest_i = i;
-			lowest = stack;
-		}
-		stack = stack->next;
-		i++;
-	}
-	return (lowest_i);
-}
-
 static int	to_insert(t_stacks *stacks, int sorted)
 {
 	int		i;
@@ -76,6 +53,13 @@ void	insertion(t_stacks *stacks, int len)
 {
 	int	i;
 
+	if (len == 3)
+	{
+		sort_three_a(stacks);
+		return ;
+	}
+	if (check_order(stacks->a))
+		return ;
 	i = 0;
 	while (i < len)
 	{
diff --git a/algorithms/utils/iterate.c b/algorithms/utils/iterate.c
index 9d58c89..cc38bdd 100644
--- a/algorithms/utils/iterate.c
+++ b/algorithms/utils/iterate.c
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/12/11 17:49:56 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/12/11 18:29:05 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/12/15 14:44:56 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -23,6 +23,8 @@ void	iterate_fn(t_stacks *stacks, int i, void (f)(t_stacks *stacks))
 
 void	optimal_rotate(t_stacks *stacks, int i, int len, char stack)
 {
+	if (i == len)
+		return ;
 	if (i && len / i >= 2)
 	{
 		if (stack == 'a')
@@ -30,7 +32,7 @@ void	optimal_rotate(t_stacks *stacks, int i, int len, char stack)
 		else
 			iterate_fn(stacks, i, &rb);
 	}
-	else
+	else if (i)
 	{
 		if (stack == 'a')
 			iterate_fn(stacks, len - i, &rra);
diff --git a/algorithms/utils/pre_sort.c b/algorithms/utils/pre_sort.c
new file mode 100644
index 0000000..bdad641
--- /dev/null
+++ b/algorithms/utils/pre_sort.c
@@ -0,0 +1,49 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   pre_sort.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/15 14:21:20 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/12/15 14:39:21 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+int	r_to_lowest(t_stack *stack, int len)
+{
+	t_stack	*lowest;
+	int		lowest_i;
+	int		i;
+
+	i = 1;
+	lowest_i = 0;
+	lowest = stack;
+	stack = stack->next;
+	while (i < len)
+	{
+		if (stack->value < lowest->value)
+		{
+			lowest_i = i;
+			lowest = stack;
+		}
+		stack = stack->next;
+		i++;
+	}
+	return (lowest_i);
+}
+
+void	sort_three_a(t_stacks *stacks)
+{
+	if (check_order(stacks->a))
+		return ;
+	optimal_rotate(stacks, r_to_lowest(stacks->a, 3), 3, 'a');
+	if (stacks->a->next->value > stacks->a->previous->value)
+	{
+		ra(stacks);
+		sa(stacks);
+		rra(stacks);
+	}
+}
diff --git a/push_swap.h b/push_swap.h
index 6901391..18eb662 100644
--- a/push_swap.h
+++ b/push_swap.h
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/12/08 14:18:06 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/12/14 16:55:24 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/12/15 14:34:45 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -58,6 +58,8 @@ void		iterate_fn(t_stacks *stacks, int i, void (f)(t_stacks *stacks));
 int			is_lowest(t_stack *stack, t_stack *node, int len);
 int			is_highest(t_stack *stack, t_stack *node, int len);
 void		optimal_rotate(t_stacks *stacks, int i, int len, char stack);
+int			r_to_lowest(t_stack *stack, int len);
+void		sort_three_a(t_stacks *stacks);
 
 /*ALGORITHMS*/
 void		bubble_alg(t_stacks *stacks);