you give matrix a b each matrix contain exactly n row m column each element a 0 1 element b initially 0you perform operation matrix b during operation choose submatrix b have size 2 time 2 replace element choose submatrix 1 in word choose integer x y 1 le x n 1 le y m set b_x y b_x y 1 b_x 1 y b_x 1 y 1 1your goal matrix b equal matrix a two matrix A b equal element matrix a equal corresponding element matrix bi possible matrix equal if come sequence operation make b equal a note do not minimize number operation