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tracyyi
Jun '22

Accoing to Goldpach Conjecture, an even can be seperated into 2 primes, and others bigger than 2 can be seperated into 3.
So if the input is 1, output -1. If it is 2, output 1. If it is even other than 2, ouput 2.
For odd, if it is 2+prime, output 2, else output 3.

Is there anything I missed? Could anyone tell me why I got WA with above?

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    Jun '22

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    Jun '22
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simes
Jun '22

There are another couple of small numbers that give -1.

simes
Jun '22

No problem. Please could you remove your code? Otherwise there will be those who will copy’n’paste your near solution.