不是有了吗？
by BotDand @ 2021-07-19 20:17:47
[「人工翻译」](https://translate.google.cn/?sl=en&tl=zh-CN&text=Farmer%20John%27s%20N%20cows%20(1%20%3C%3D%20N%20%3C%3D%2050%2C000)%20are%20located%20at%20distinct%20points%20in%20his%20two-dimensional%20pasture.%20In%20the%20middle%20of%20the%20pasture%20is%20a%20large%20circular%20grain%20silo.%20Cows%20on%20opposite%20sides%20of%20the%20silo%20cannot%20see%20each-other%2C%20since%20the%20silo%20blocks%20their%20view.%20Please%20determine%20the%20number%20of%20pairs%20of%20cows%20that%20can%20see%20each-other%20via%20a%20direct%20line%20of%20sight.%0A%0AThe%20grain%20silo%20is%20centered%20at%20the%20origin%20(0%2C0)%20and%20has%20radius%20R.%20No%20cow%20is%20located%20on%20or%20inside%20the%20circle%20corresponding%20to%20the%20silo%2C%20and%20no%20two%20cows%20lie%20on%20a%20tangent%20line%20to%20the%20silo.%20The%20value%20of%20R%20is%20in%20the%20range%201..1%2C000%2C000%2C%20and%20each%20cow%20lives%20at%20a%20point%20with%20integer%20coordinates%20in%20the%20range%20-1%2C000%2C000..%2B1%2C000%2C000.&op=translate)
by _caiji_ @ 2021-07-19 20:18:33