Merge pull request #2 from M46F/python-sorting

add multiple sorting algo in python

Author: cookie-byte

Algorithms/sorting/bubble_sort.py

@@ -0,0 +1,12 @@
+def bubble_sort(arr):
+    size = len(arr)
+    for i in range(size):
+        for j in range(size-1):
+            if arr[j] > arr[j+1]:
+                arr[j], arr[j+1] = arr[j+1], arr[j]
+
+
+arr = [5,4,3,1,2,3,1,1,3]
+print('before', arr)
+bubble_sort(arr)
+print('after', arr)

Algorithms/sorting/insertion_sort.py

@@ -0,0 +1,16 @@
+def insertion_sort(arr):
+    size = len(arr)
+    for i in range(1,size):
+        value = arr[i]
+        hole = i
+        while hole > 0 and arr[hole-1] > value:
+            arr[hole] = arr[hole-1]
+            hole -= 1
+        arr[hole] = value
+
+
+arr = [5,4,3,1,2,3,1,1,3]
+print('before', arr)
+insertion_sort(arr)
+print('after', arr)
+

Algorithms/sorting/merge_sort.py

@@ -0,0 +1,37 @@
+def merge_sort(arr):
+    if len(arr) > 1:
+        mid = len(arr)//2
+        left_arr = arr[:mid]
+        right_arr = arr[mid:]
+
+        merge_sort(left_arr)
+        merge_sort(right_arr)
+
+        left_idx = right_idx = curr_idx = 0
+
+        while left_idx < len(left_arr) and right_idx < len(right_arr):
+            if left_arr[left_idx] < right_arr[right_idx]:
+                arr[curr_idx] = left_arr[left_idx]
+                left_idx += 1
+            else:
+                arr[curr_idx] = right_arr[right_idx]
+                right_idx += 1
+            curr_idx += 1
+
+
+        while left_idx < len(left_arr):
+            arr[curr_idx] = left_arr[left_idx]
+            left_idx += 1
+            curr_idx += 1
+
+        while right_idx < len(right_arr):
+            arr[curr_idx] = right_arr[right_idx]
+            right_idx += 1
+            curr_idx += 1
+
+
+arr = [5,4,3,1,2,3,1,1,3]
+print('before', arr)
+merge_sort(arr)
+print('after', arr)
+

Algorithms/sorting/quick_sort.py

@@ -0,0 +1,27 @@
+def partition(arr, low, high):
+    i = low - 1
+    pivot = arr[high]
+    for j in range(low, high):
+        if arr[j] <= pivot:
+            i += 1
+            arr[i],arr[j] = arr[j],arr[i]
+    arr[i+1], arr[high] = arr[high], arr[i+1]
+    return i + 1
+
+
+def quick_sort_func(arr, low, high):
+    if low < high:
+        partition_idx = partition(arr, low, high)
+
+        quick_sort_func(arr, low, partition_idx-1)
+        quick_sort_func(arr, partition_idx+1, high)
+
+def quick_sort(arr):
+    quick_sort_func(arr, 0, len(arr)-1)
+
+
+arr = [5,4,3,1,2,3,1,1,3]
+print('before', arr)
+quick_sort(arr)
+print('after', arr)
+