输入包括一系列矩阵描述。每个矩阵描述的第一行是 m 和 n，即矩阵的行数和列数；之后的 m 行，每行包括 n 个以空格分开的整数，则是当前矩阵的值，注意矩阵的值未必是正数。-Input, including a series of matrix descr iption. Each matrix described in the first row is m and n, i.e. the number of rows of the matrix and the number of columns　after m rows, each row including n separated by spaces integer is the value of the current matrix, attention to the values ​ ​ of the matrix is not necessarily a positive number.