摘要：
题目描述 Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 阅读全文
摘要：
题目描述 On a plane are nn points ( x_{i}xi , y_{i}yi ) with integer coordinates between 00 and 10^{6}106 . The distance between the two points with num 阅读全文