摘要：
链接：https://www.nowcoder.com/acm/contest/140/J来源：牛客网 White Rabbit has a rectangular farmland of n*m. In each of the grid there is a kind of plant. The 阅读全文
摘要：
Matrix Given 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] = 阅读全文