I submitted code for the problem problem D. My incorrect submission is Incorrect while accepted solution is Accepted. As you can see that i changed from calculating the whole area and then remove sector area to simply adding areas of segments.But why should precision differ so much? I could not find the reason for this.
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Let's say you want to calculate x - y where x = 25000 and y = 24997. The answer should be 3. But it turns out that you first calculated x with precision error 10 - 4 and you got x = 24997.5. You would now print x - y = 0.5, instead of 3.
Apparently, you encountered something similar there. It isn't good to calculate something with/on big numbers and then subtract them, because smaller precision error may change to very big one.