QOJ.ac
QOJ
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magnus
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1800
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0
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$$ F(n,m)=\sum_{i=1}^{n}\sum_{j=1}^{m} \bigl(i\cdot j\cdot \varphi(\gcd(i,j))\bigr) $$
Rating changes
Accepted problems：2 problems
Tried problems：0 problem
None
Authored problems：0 problem
NoneVirtual Participations：1 contest
| Name | Start time |
|---|---|
| USACO 2026 First Contest (Bronze) | 2026-01-19 19:52:54 |