given an integer $$$n$$$, find the number of $$$(i,j,k)$$$ so that:
$$$1<i<j<k<=n$$$.
$$$i*j*k$$$ is a perfect square.
$$$3<n<=10^5$$$
→ Обратите внимание
До соревнования
Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
5 дней
Зарегистрироваться »
Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
5 дней
Зарегистрироваться »
*есть доп. регистрация
→ Лидеры (рейтинг)
| № | 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 → |
→ Лидеры (вклад)
| № | 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 | 156 |
| 8 | TheScrasse | 154 |
| 9 | Dominater069 | 153 |
| 10 | nor | 152 |
→ Найти пользователя
→ Прямой эфир
Codeforces (c) Copyright 2010-2024 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 25.11.2024 10:07:21 (i2).
Десктопная версия, переключиться на мобильную.
При поддержке
Im dumb so pls don't take this seriously though. I can now think of a O(N*sqrt(N)) solution, would it be exceeded time limit cause u did not mention the time.
the time limit 1.5s
well, 1e5*1e3=1e8 (could be less) might still get the job done.
what's your approach (help me pls)
It would probably be okay even with just 1 second TL, $$$n$$$ is only $$$10^5$$$, not even $$$2 \cdot 10^5$$$ or something.
can you give me the idea of your solution