не понятно#146
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IlyaOrlov
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Jul 12, 2023
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Добавил комментарии по HW5.1.py
Для лучшего понимания стоит пройти алгоритм пошагово в режиме отладчика.
| @@ -0,0 +1,23 @@ | |||
| # Реализовать алгоритм сортировки от мин к макс | |||
| def mini(s): # функц поиск минимального значения | |||
| min_num = float('inf') # минимальное значение почему-то +бесконечность?! | |||
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Изначально, пока мы не начали смотреть строку, у нас нет какого-либо минимального значения. А сравнивать items уже с чем-то надо (стр.6).
+бесконечность - значение, больше которого заведомо не будет - при первом же сравнении заменится на начальный элемент в s.
| def sort_min(x): # функция сортировки | ||
| i = 0 | ||
| while i < len(x): | ||
| min_idx, min_num = mini(x[i:]) # почему функц мини накидываем на срез? |
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Потому что список x до i уже отсортирован и содержит минимальные значения.
| while i < len(x): | ||
| min_idx, min_num = mini(x[i:]) # почему функц мини накидываем на срез? | ||
| if min_idx != 0: | ||
| x[i], x[min_idx + i] = x[min_idx + i], x[i] # какое i добавляется? |
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min_idx - это относительный индекс в срезе.
Чтоб получить корректный индекс, надо добавить к min_idx индекс начала среза - i.
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