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Алгоритмы и структуры данных. Извлечение информации на языке Java
book

Алгоритмы и структуры данных. Извлечение информации на языке Java

by Аллен Б. Доуни
June 2018
Beginner to intermediate
240 pages
3h 54m
Russian
Piter Press, Ltd.
Content preview from Алгоритмы и структуры данных. Извлечение информации на языке Java
128
Глава 10. Хеширование
Моя реализация put и get выглядит следующим образом:
public V put(K key, V value) {
MyLinearMap<K, V> map = chooseMap(key);
return map.put(key, value);
}
public V get(Object key) {
MyLinearMap<K, V> map = chooseMap(key);
return map.get(key);
}
Довольно просто, не правда ли? В обоих методах мы используем
chooseMap для поиска правильной подкарты, а затем вызываем
метод для нее. Вот как это работает; теперь подумаем о произ-
водительности.
Если n записей распределено между k ключей, то в среднем на
одну карту приходится n / k записей. При поиске ключа нужно
вычислить его хеш-код, что занимает некоторое время, затем
искать соответствующую подкарту.
Поскольку списки записей в MyBetterMap в k раз короче, чем
список записей в
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Publisher Resources

ISBN: 9785446105724