Symmetric matrix P61473

Statement

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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× n with n ≥ 0.

Interface

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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