摘要：
Mobile phonesTime Limit:5000MSMemory Limit:65536KTotal Submissions:9263Accepted:4154DescriptionSuppose that the fourth generation mobile phone base stations in the Tampere area operate as follows. The area is divided into squares. The squares form an S * S matrix with the rows and columns numbered f 阅读全文
摘要：
MatrixTime Limit:3000MSMemory Limit:65536KTotal Submissions:10544Accepted:3945DescriptionGiven an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1 <= i, j <= N).We can change the matrix in the following w 阅读全文