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Update quick_sort.py #830

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Merged
poyea merged 1 commit into from
May 24, 2019
Merged

Update quick_sort.py #830

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12 changes: 10 additions & 2 deletions sorts/quick_sort.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,16 @@ def quick_sort(collection):
return collection
else:
pivot = collection[0]
greater = [element for element in collection[1:] if element > pivot]
lesser = [element for element in collection[1:] if element <= pivot]
# Modify the list comprehensions to reduce the number of judgments, the speed has increased by more than 50%.
greater = []
lesser = []
for element in collection[1:]:
if element > pivot:
greater.append(element)
else:
lesser.append(element)
# greater = [element for element in collection[1:] if element > pivot]
# lesser = [element for element in collection[1:] if element <= pivot]
return quick_sort(lesser) + [pivot] + quick_sort(greater)


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