Product of square matrices P37390

Statement

Write a function that, given two square matrices @a@ and @b@, computes their product.

Interface

C++	`typedef vector< vector<int> > Matrix; Matrix product(const Matrix& a, const Matrix& b);`
MyPy	`Matrix: TypeAlias = list[list[int]] def product(a: Matrix, b: Matrix) -> Matrix`

@a@ and @b@ are square matrices $n\times n$ with $n \ge 0$ .

Information