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Discussion of Problem 1265. Mirror

AC!I think it is a good maths problem:)
Posted by Yu Yuanming 2 Jul 2005 14:24
At first,I use line equation, I assume perc = 1e-6, WA#6...
and then prec = 1e-12, WA#9...:(

It seems that the prec is terrible...

Finally, I found that uses vectos with some calculate improvement, it needs only add, sub, mul...
Just maths jobs...

It can AC easily:)