mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-10-06 13:49:30 +00:00
83 lines
1.8 KiB
Python
83 lines
1.8 KiB
Python
def binary_search(lst, item, start, end):
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if start == end:
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return start if lst[start] > item else start + 1
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if start > end:
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return start
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mid = (start + end) // 2
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if lst[mid] < item:
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return binary_search(lst, item, mid + 1, end)
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elif lst[mid] > item:
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return binary_search(lst, item, start, mid - 1)
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else:
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return mid
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def insertion_sort(lst):
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length = len(lst)
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for index in range(1, length):
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value = lst[index]
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pos = binary_search(lst, value, 0, index - 1)
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lst = lst[:pos] + [value] + lst[pos:index] + lst[index + 1 :]
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return lst
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def merge(left, right):
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if not left:
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return right
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if not right:
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return left
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if left[0] < right[0]:
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return [left[0], *merge(left[1:], right)]
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return [right[0], *merge(left, right[1:])]
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def tim_sort(lst):
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"""
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>>> tim_sort("Python")
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['P', 'h', 'n', 'o', 't', 'y']
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>>> tim_sort((1.1, 1, 0, -1, -1.1))
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[-1.1, -1, 0, 1, 1.1]
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>>> tim_sort(list(reversed(list(range(7)))))
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[0, 1, 2, 3, 4, 5, 6]
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>>> tim_sort([3, 2, 1]) == insertion_sort([3, 2, 1])
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True
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>>> tim_sort([3, 2, 1]) == sorted([3, 2, 1])
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True
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"""
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length = len(lst)
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runs, sorted_runs = [], []
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new_run = [lst[0]]
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sorted_array = []
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i = 1
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while i < length:
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if lst[i] < lst[i - 1]:
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runs.append(new_run)
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new_run = [lst[i]]
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else:
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new_run.append(lst[i])
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i += 1
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runs.append(new_run)
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for run in runs:
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sorted_runs.append(insertion_sort(run))
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for run in sorted_runs:
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sorted_array = merge(sorted_array, run)
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return sorted_array
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def main():
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lst = [5, 9, 10, 3, -4, 5, 178, 92, 46, -18, 0, 7]
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sorted_lst = tim_sort(lst)
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print(sorted_lst)
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if __name__ == "__main__":
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main()
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