funforever

摘要： Given a N × N matrix A, whose element in the i-th row and j-th column Aij is an number that equals i2 + 100000 × i + j2 - 100000 × j + i × j, you are 阅读全文

摘要： Santa has to send presents to the kids. He has a large stack of nn presents, numbered from 11 to nn; the topmost present has number a1a1, the next pre 阅读全文