def merge(arr):
if len(arr) == 1:
return arr
length = len(arr)
arr1 = merge(arr[0 : length // 2])
arr2 = merge(arr[length // 2 : length])
temp = []
index1 = 0
index2 = 0
while index1 < len(arr1) and index2 < len(arr2):
if arr1[index1] > arr2[index2]:
temp.append(arr2[index2])
index2 += 1
else:
temp.append(arr1[index1])
index1 += 1
if index1 < len(arr1):
for i in range(index1, len(arr1)):
temp.append(arr1[i])
else:
for i in range(index2, len(arr2)):
temp.append(arr2[i])
return temp
arr = [8, 4, 5, 7, 1, 3, 6, 2]
arr = merge(arr)
print(arr)
arr = [8, 4, 5, 7, 1, 3, 6, 2, 9]
arr = merge(arr)
print(arr)
