摘要：
Problem DescriptionThere was no donkey in the province of Gui Zhou, China. A trouble maker shipped one and put it in the forest which could be conside... 阅读全文
摘要：
Problem DescriptionThanks to a certain "green" resources company, there is a new profitable industry of oil skimming. There are large slicks of crude ... 阅读全文
摘要：
Problem DescriptionLuxer is a really bad guy. He destroys everything he met. One day Luxer went to D-city. D-city has N D-points and M D-lines. Each D... 阅读全文