摘要：
Problem DescriptionTeacher Mai hasnnumbersa1,a2,⋯,anandn−1operators("+", "-" or "*")op1,op2,⋯,opn−1, which are arranged in the forma1op1a2op2a3⋯an.He ... 阅读全文
摘要：
Problem DescriptionA sequence b1,b2,⋯,bn are called (d1,d2)-arithmetic sequence if and only if there exist i(1≤i≤n) such that for every j(1≤j 2 #inclu... 阅读全文
摘要：
Problem DescriptionTeacher Mai is in a maze with n rows and m columns. There is a non-negative number in each cell. Teacher Mai wants to walk from the... 阅读全文