摘要：F - Cycling Roads F - Cycling Roads Description When Vova was in Shenzhen, he rented a bike and spent most of the time cycling around the city. Vova w 阅读全文

摘要：TOYS Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts 阅读全文

摘要：1007: [HNOI2008]水平可见直线 Description 在xoy直角坐标平面上有n条直线L1,L2,...Ln,若在y值为正无穷大处往下看,能见到Li的某个子线段,则称Li为可见的,否则Li为被覆盖的. 例如,对于直线: L1:y=x; L2:y=-x; L3:y=0 则L1和L2是可 阅读全文