Symmetric matrix P61473

Statement

Write a function that, given a square matrix @m@, tells if it is symmetric or not.

Remember that a matrix $m$ is symmetric if $m_{i,j}=m_{j,i}$ for any $i$ and for any $j$ .

Precondition

@m@ is a square matrix $n\times n$ with $n \ge 0$ .

C++	`typedef vector< vector<int> > Matrix;`
	`bool is_symmetric(const Matrix& m);`
Java	`public static boolean isSymmetric(int[][] m);`
Python	`is_symmetric(m) # returns bool`
MyPy	`is_symmetric(m: list[list[int]]) -> bool`

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