Ambiguity in the description which makes life hard
In the description:\n\n\nThe value of coordinate (a, b) of the matrix is the XOR of all matrix[i][j] where 0 <= i <= a < m and 0 <= j <= b < n (0-indexed).\n\n\
In the description:\n\n```\nThe value of coordinate (a, b) of the matrix is the XOR of all matrix[i][j] where 0 <= i <= a < m and 0 <= j <= b < n (0-indexed).\n```\n\nIt seems telling us the matrix is the XOR of all the element in rang `[0, 0]` to `[a, b]`. however checking the solution which are accepted, it seems like it\'s real value in the matrix, and we need to get the XOR of the real value.\n\nI found that the description of the issue some time make your life **extremely** hard,  and there is usually has no good way to clarify the real case here because the sample case also looks ambiguity.\n\n
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