Placement of Blocks in a 2D Matrix

Ron has been assigned a simple problem in his class. He has been given a 2D square Matrix and the indexing starts from 0. Each cell of the matrix contains either 0 or 1 where 0 represents empty cell and 1 represents a block present in the cell. As per the instruction provided, a block can be placed only at the cell with both row and column value being odd, for example, (1,1), (3,3), etc. Ron needs