From 7417932ba465610d2b7f6770253230975188deb4 Mon Sep 17 00:00:00 2001
From: Canule <160742623+Raunak-2005@users.noreply.github.com>
Date: Tue, 15 Oct 2024 13:51:42 +0530
Subject: [PATCH 1/2] Added Quick Sort Program

---
 divide_and_conquer/quicksort.py | 69 +++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 divide_and_conquer/quicksort.py

diff --git a/divide_and_conquer/quicksort.py b/divide_and_conquer/quicksort.py
new file mode 100644
index 000000000000..d40a905a258b
--- /dev/null
+++ b/divide_and_conquer/quicksort.py
@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+def partition(array: list, start: int, end: int) -> int:
+    """Helper function for Quick Sort.
+
+    >>> array = [5, 8, 3, 2, 9, 6]
+    >>> start = 0
+    >>> end = 5
+    >>> index = partition(array, start, end)
+    >>> index  # The pivot index
+    3
+    >>> sorted(array[:index])  # Elements less than pivot
+    [2, 3, 5]
+    >>> sorted(array[index+1:])  # Elements greater than pivot
+    [8, 9]
+
+    >>> array = []
+    >>> start = 0
+    >>> end = 0
+    >>> partition(array, start, end)
+    0
+    >>> array
+    []
+    """
+    if not array: 
+        return 0
+    pivot = array[end]
+    index = start - 1
+    for j in range(start, end):
+        if array[j] <= pivot:
+            index += 1
+            array[index], array[j] = array[j], array[index]
+    array[index+1], array[end] = array[end], array[index+1]
+    return index+1
+
+def quicksort(array, start, end):
+    """Returns a list of sorted array elements using Quick Sort.
+
+    >>> from random import shuffle
+    >>> array = [5, 8, 3, 2, 9, 6]
+    >>> start = 0
+    >>> end = 5
+    >>> quicksort(array, start, end)
+    >>> array
+    [2, 3, 5, 6, 8, 9]
+
+    >>> shuffle(array)
+    >>> quicksort(array, start, end)
+    >>> array
+    [2, 3, 5, 6, 8, 9]
+
+    >>> array = [-100]
+    >>> quicksort(array, 0, len(array) - 1)
+    >>> array
+    [-100]
+
+    >>> array = []
+    >>> quicksort(array, 0, 0)
+    >>> array
+    []
+    """
+    if start < end:
+        partition_index = partition(array, start, end)
+        quicksort(array, start, partition_index-1)
+        quicksort(array, partition_index+1, end)
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()

From 7299b9c866faa6b25c6ffe4239fcca2430d3a884 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Tue, 15 Oct 2024 08:33:24 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 divide_and_conquer/quicksort.py | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/divide_and_conquer/quicksort.py b/divide_and_conquer/quicksort.py
index d40a905a258b..87ccad4c9969 100644
--- a/divide_and_conquer/quicksort.py
+++ b/divide_and_conquer/quicksort.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+
 def partition(array: list, start: int, end: int) -> int:
     """Helper function for Quick Sort.
 
@@ -22,7 +23,7 @@ def partition(array: list, start: int, end: int) -> int:
     >>> array
     []
     """
-    if not array: 
+    if not array:
         return 0
     pivot = array[end]
     index = start - 1
@@ -30,8 +31,9 @@ def partition(array: list, start: int, end: int) -> int:
         if array[j] <= pivot:
             index += 1
             array[index], array[j] = array[j], array[index]
-    array[index+1], array[end] = array[end], array[index+1]
-    return index+1
+    array[index + 1], array[end] = array[end], array[index + 1]
+    return index + 1
+
 
 def quicksort(array, start, end):
     """Returns a list of sorted array elements using Quick Sort.
@@ -61,9 +63,11 @@ def quicksort(array, start, end):
     """
     if start < end:
         partition_index = partition(array, start, end)
-        quicksort(array, start, partition_index-1)
-        quicksort(array, partition_index+1, end)
+        quicksort(array, start, partition_index - 1)
+        quicksort(array, partition_index + 1, end)
+
 
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()