June 2018
Beginner to intermediate
240 pages
3h 54m
Russian
Content preview from Алгоритмы и структуры данных. Извлечение информации на языке Java
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Выбор структуры данных
Теперь, когда стало понятно, что такое индекс и какие операции
он выполняет, можно создать структуру данных для его пред-
ставления.
Выбор структуры данных
Основная операция индекса — это поиск; в частности, требуется
возможность искать термин и находить все страницы, где он
есть. Простейшей реализацией будет выборка страниц. С учетом
поискового термина можно было бы перебирать содержимое
страниц и выбирать те из них, которые включают данный термин.
Но время выполнения будет пропорционально общему количе-
ству слов на всех страницах, что слишком замедлит поиск.
Лучшая альтернатива — карта. Это структура данных, которая
представляет собой набор пар «ключ — значение» и обеспечивает
быстрый способ поиска ключа и нахождения ...
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