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Input n*n matrix and replace the corner elements by character first and boundary elements by character second. Rest all the elements should remain the same. FIRST CHARACTER: @ SECOND CHARACTER: ? ### Input - First line contains 'n' - Then 'n' lines follow with 'n' numbers in each line ### Output - output the required matrix. ### Constraints - $1 \leq n \leq 1000$ ### Subtasks - 30 points :

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solution.cppC++17

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