mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-10-06 13:49:30 +00:00
02c0daf9e5
* Adding variable to fade out ambiguity * More readability on merge sorting algorithm * Updating merge_sort_fastest description and explaining why * Adding tests file with imports * Standardazing filenames and function names * Adding test cases and test functions * Adding test loop * Putting 'user oriented code' inside main condition for having valid imports * Fixing condition * Updating tests: adding cases and todo list * Refactoring first euler problem's first solution
83 lines
1.8 KiB
Python
83 lines
1.8 KiB
Python
from __future__ import print_function
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def binary_search(lst, item, start, end):
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if start == end:
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if lst[start] > item:
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return start
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else:
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return 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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runs, sorted_runs = [], []
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length = len(lst)
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new_run = [lst[0]]
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sorted_array = []
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for i in range(1, length):
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if i == length - 1:
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new_run.append(lst[i])
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runs.append(new_run)
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break
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if lst[i] < lst[i - 1]:
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if not new_run:
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runs.append([lst[i - 1]])
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new_run.append(lst[i])
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else:
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runs.append(new_run)
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new_run = []
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else:
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new_run.append(lst[i])
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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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