old_contents: def merge(L,R,A):    # Recursive and stable(for equal numbers it preserves their original position) algorithm
  	nL=len(L)
  	nR=len(R)
  	i=0
  	j=0
  	k=0
  
  	while i<nL and j<nR:
  		if L[i]<R[j]:
  			A[k]=L[i]
  			i+=1
  		else:
  			A[k]=R[j]
  			j+=1
  		k+=1
  
  	while i<nL:
  		A[k]=L[i]
  		i+=1
  		k+=1
  	while j<nR:
  		A[k]=R[j]
  		j+=1
  		k+=1
  
  
  def mergesort(A):    # Time complexity is Worst Case:- O(nlogn)
  	n=len(A)	     # Space complexity is O(n)
  	if n<2:
  		return A
  	mid=n/2
  	left=A[:mid]
  	right=A[mid:]
  	mergesort(left)
  	mergesort(right)
  	merge(left,right,A)
  	return A
  
  print mergesort([2,4,1,6,8,5,3])
  
new_contents: # ALAINA KAFKES IMPLEMENTATION - alainakafkes
  
  ## Mergesort implementation in Python
  ## Runtime: O(n log(n))
  ## Space: O(n)
  ## Advantages: guaranteed good complexity (no need to worry about choice of pivot as in quicksort)
  ## Disadvantages: more temporary data storage needed than quicksort
  
  #def mergesort(arr):
  #    if len(arr) <= 1:
  #        return arr
  #    midpoint = len(arr) // 2
  #    return merger(mergesort(arr[:mid]), mergesort(arr[mid:]))
  #def merger(arrLeft, arrRight):
  #    if not arrLeft:
  #        return arrRight
  #    if not arrRight:
  #        return arrLeft
  #    if arrLeft[0] < arrRight[0]:
  #        return arrLeft[0] + merger(arrLeft[1:], arrRight)
  #    return arrRight[0] + merger(arrLeft, arrRight[1:])
  
  
  
  # YASH KATARIYA IMPLEMENTATION - yashk2810
  def merge(L,R,A):    # Recursive and stable(for equal numbers it preserves their original position) algorithm
  	nL=len(L)
  	nR=len(R)
  	i=0
  	j=0
  	k=0
  
  	while i<nL and j<nR:
  		if L[i]<R[j]:
  			A[k]=L[i]
  			i+=1
  		else:
  			A[k]=R[j]
  			j+=1
  		k+=1
  
  	while i<nL:
  		A[k]=L[i]
  		i+=1
  		k+=1
  	while j<nR:
  		A[k]=R[j]
  		j+=1
  		k+=1
  
  
  def mergesort(A):    # Time complexity is Worst Case:- O(nlogn)
  	n=len(A)	     # Space complexity is O(n)
  	if n<2:
  		return A
  	mid=n/2
  	left=A[:mid]
  	right=A[mid:]
  	mergesort(left)
  	mergesort(right)
  	merge(left,right,A)
  	return A
  
  print mergesort([2,4,1,6,8,5,3])
  
subject: Update mergesort.py