given an integer $$$n$$$, find the number of $$$(i,j,k)$$$ so that:
$$$1 \lt i \lt j \lt k \lt =n$$$.
$$$i*j*k$$$ is a perfect square.
$$$3 \lt n \lt =10^5$$$
given an integer $$$n$$$, find the number of $$$(i,j,k)$$$ so that:
$$$1 \lt i \lt j \lt k \lt =n$$$.
$$$i*j*k$$$ is a perfect square.
$$$3 \lt n \lt =10^5$$$
| # | User | Rating |
|---|---|---|
| 1 | Benq | 3792 |
| 2 | VivaciousAubergine | 3647 |
| 3 | Kevin114514 | 3603 |
| 4 | jiangly | 3583 |
| 5 | turmax | 3559 |
| 6 | tourist | 3541 |
| 7 | strapple | 3515 |
| 8 | ksun48 | 3461 |
| 9 | dXqwq | 3436 |
| 10 | Otomachi_Una | 3413 |
| # | User | Contrib. |
|---|---|---|
| 1 | Qingyu | 157 |
| 2 | adamant | 153 |
| 3 | Um_nik | 147 |
| 4 | Proof_by_QED | 146 |
| 5 | Dominater069 | 145 |
| 6 | errorgorn | 142 |
| 7 | cry | 139 |
| 8 | YuukiS | 135 |
| 9 | TheScrasse | 134 |
| 10 | chromate00 | 133 |
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