I need to know a way to remove elements in O(1) time . I used hash table , put the values as keys but there is a problem that the values are not distinct . Is there a way to remove elements in O(1) time if they aren't distinct ?
№ | Пользователь | Рейтинг |
---|---|---|
1 | tourist | 3993 |
2 | jiangly | 3743 |
3 | orzdevinwang | 3707 |
4 | Radewoosh | 3627 |
5 | jqdai0815 | 3620 |
6 | Benq | 3564 |
7 | Kevin114514 | 3443 |
8 | ksun48 | 3434 |
9 | Rewinding | 3397 |
10 | Um_nik | 3396 |
Страны | Города | Организации | Всё → |
№ | Пользователь | Вклад |
---|---|---|
1 | cry | 167 |
2 | Um_nik | 163 |
3 | maomao90 | 162 |
3 | atcoder_official | 162 |
5 | adamant | 159 |
6 | -is-this-fft- | 158 |
7 | awoo | 155 |
8 | TheScrasse | 154 |
9 | Dominater069 | 153 |
10 | djm03178 | 152 |
I need to know a way to remove elements in O(1) time . I used hash table , put the values as keys but there is a problem that the values are not distinct . Is there a way to remove elements in O(1) time if they aren't distinct ?
Название |
---|
I'm not exactly sure of what you mean, but using a linked list seems to be the solution to your problem.
No , I don't think that it will work . What I meant is that assume you have an array of numbers . You perform some operations and then come up with a number , you want to delete this element from the array in O(1) time . I want to know what is the best data structure to use at this moment .
Do you want to delete an element with value x, or an element with index x?
an element with value x .
You could use a hash table of vectors where each entry of the hash table consist of the list of indexes of that value that you want to delete. If you want to select a particular index in O(1) time, you can compress the indexes.
thanks I will try this way .