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Hi Friends!
Here comes the 3-rd problem sent to me by our colleague Kevin some time ago. It is in "test mode" which means you can safely test it with various outputs etc - if the answer is correct it will say so, but won't (yet) register it as solved. As soon as you could kindly try it and confirm it is fine, we'll make update so everyone can submit it in "normal mode".
There could be some issues mainly because I was made small modifications to Kevin's code to fit it to the system and of course made some mistakes - hopefully I fixed them, but your cross-check would be quite welcome!
Kevin,
Thanks again for another interesting problem. The description is very clear and the checker seems to be working correctly. It is easy to use the previous program to check that a result is correct before submitting it. The code checker in 404 then agrees that the result is correct.
Thank you Rodion for uploading this problem! It does indeed appear that the checker is working correctly as far as I can tell. I feel like I can learn quite a few new PHP tricks/improvements by going through your modifications to the code as well :)
And thank you for the kind words CSF!
Clive, Kevin, thanks a lot for verification! Checker has be updated so answers should be accepted now.