摘要:
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是可见的,L3是被覆盖的.给出n条直线,表示成y=Ax+ 阅读全文
摘要:
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 20760 Accepted Submission(s): 6325 Problem Descri 阅读全文