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cocktailSort.py
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cocktailSort.py
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# Python program for implementation of Cocktail Sort
def cocktailSort(a):
n = len(a)
swapped = True
start = 0
end = n-1
while (swapped == True):
# reset the swapped flag on entering the loop,
# because it might be true from a previous
# iteration.
swapped = False
# loop from left to right same as the bubble
# sort
for i in range(start, end):
if (a[i] > a[i + 1]):
a[i], a[i + 1] = a[i + 1], a[i]
swapped = True
# if nothing moved, then array is sorted.
if (swapped == False):
break
# otherwise, reset the swapped flag so that it
# can be used in the next stage
swapped = False
# move the end point back by one, because
# item at the end is in its rightful spot
end = end-1
# from right to left, doing the same
# comparison as in the previous stage
for i in range(end-1, start-1, -1):
if (a[i] > a[i + 1]):
a[i], a[i + 1] = a[i + 1], a[i]
swapped = True
# increase the starting point, because
# the last stage would have moved the next
# smallest number to its rightful spot.
start = start + 1
# Driver code
a = [5, 1, 4, 2, 8, 0, 2]
cocktailSort(a)
print("Sorted array is:")
for i in range(len(a)):
print("% d" % a[i])