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# Python program for implementation of MergeSort
# https://www.geeksforgeeks.org/merge-sort/
import random
def mergeSort(arr):
if len(arr) > 1:
# Finding the mid of the array
mid = len(arr)//2
# Dividing the array elements
L = arr[:mid]
# into 2 halves
R = arr[mid:]
# Sorting the first half
mergeSort(L)
# Sorting the second half
mergeSort(R)
i = j = k = 0
# Copy data to temp arrays L[] and R[]
while i < len(L) and j < len(R):
if L[i] < R[j]:
arr[k] = L[i]
i += 1
else:
arr[k] = R[j]
j += 1
k += 1
# Checking if any element was left
while i < len(L):
arr[k] = L[i]
i += 1
k += 1
while j < len(R):
arr[k] = R[j]
j += 1
k += 1
def mkRandList ( n ):
a=[]
for i in range(1,n+1):
a.insert(0, random.randint(0,10000))
return a
a = mkRandList(800000)
#a = mkRandList(8)
mergeSort(a)
#print(a)
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