mathforces's blog

By mathforces, history, 3 years ago, In English,

I tried to think of many different approaches to this problem but still can't figure out. Can you guys give me a hint? Thank you so much.


Give N circles. Calculate the total area that these N circles cover. The i-th circle has coordinate of center (Xi, Yi) and radius Ri.

1 ≤ N ≤ 50. -10000 ≤ Yi-Ri, Yi + Ri, Xi-Ri, Xi + Ri ≤ 10000

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