Problem 1387. Points on a circle.
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Great problem! Learned a bunch from others solutions as well.
In the problem statement, I think you meant '3' and '4', rather than '1' and '2', in the respective +/- combinations.
Thanks for catching my stupidity on that one, HH. It's fixed now.
The tip for this question is the sum of squares function, which I use in my solution. There are many possible solutions to this problem, but the huge circle radii limit what we can employ, so be careful.
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