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Update adaptive_merge_sort.py

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ANANT JAIN 2024-10-17 12:21:53 +05:30 committed by GitHub
parent 723ab7faf0
commit 0eaeffbcf8
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1 changed files with 7 additions and 42 deletions
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sorts/adaptive_merge_sort.py
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@ -1,20 +1,4 @@
def adaptive_merge_sort(sequence: list) -> list: def adaptive_merge_sort(sequence: list) -> list:
"""
Sorts a list using the Adaptive Merge Sort algorithm.
>>> adaptive_merge_sort([4, 3, 1, 2])
Initial sequence: [4, 3, 1, 2]
Sorting: array[0:2] and array[2:4]
Sorting: array[0:1] and array[1:2]
Merging: array[0:1] and array[1:2]
After merge: [3, 4]
Sorting: array[2:3] and array[3:4]
Skipping merge as array[2] <= array[3]
Merging: array[0:2] and array[2:4]
After merge: [1, 2, 3, 4]
Sorted sequence: [1, 2, 3, 4]
[1, 2, 3, 4]
"""
if len(sequence) < 2: if len(sequence) < 2:
return sequence return sequence
@ -26,19 +10,6 @@ def adaptive_merge_sort(sequence: list) -> list:
def adaptive_merge_sort_helper(array: list, aux: list, low: int, high: int) -> None: def adaptive_merge_sort_helper(array: list, aux: list, low: int, high: int) -> None:
"""
Helper function for Adaptive Merge Sort algorithm.
>>> adaptive_merge_sort_helper([4, 3, 1, 2], [4, 3, 1, 2], 0, 3)
Sorting: array[0:2] and array[2:4]
Sorting: array[0:1] and array[1:2]
Merging: array[0:1] and array[1:2]
After merge: [3, 4]
Sorting: array[2:3] and array[3:4]
Skipping merge as array[2] <= array[3]
Merging: array[0:2] and array[2:4]
After merge: [1, 2, 3, 4]
"""
if high <= low: if high <= low:
return return
@ -57,23 +28,17 @@ def adaptive_merge_sort_helper(array: list, aux: list, low: int, high: int) -> N
def merge(array: list, aux: list, low: int, mid: int, high: int) -> None: def merge(array: list, aux: list, low: int, mid: int, high: int) -> None:
"""
Merges two sorted subarrays of the main array.
>>> merge([4, 3, 1, 2], [4, 3, 1, 2], 0, 1, 3)
Merging: array[0:2] and array[2:4]
After merge: [1, 2, 3, 4]
"""
print(f"Merging: array[{low}:{mid + 1}] and array[{mid + 1}:{high + 1}]") print(f"Merging: array[{low}:{mid + 1}] and array[{mid + 1}:{high + 1}]")
i, j = low, mid + 1 i, j = low, mid + 1
for k in range(low, high + 1): for k in range(low, high + 1):
if i > mid: if i > mid or j > high:
aux[k] = array[j] if i > mid:
j += 1 aux[k] = array[j]
elif j > high: j += 1
aux[k] = array[i] else:
i += 1 aux[k] = array[i]
i += 1
elif array[i] <= array[j]: elif array[i] <= array[j]:
aux[k] = array[i] aux[k] = array[i]
i += 1 i += 1