Sum of square matrices P26374

Statement

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

Interface

C++	typedef vector< vector<int> > Matrix;
	Matrix sum(const Matrix& a, const Matrix& b);
Java	public static int[][] sum(int[][] a, int[][] b);
Python	sum(a, b) # returns list
	sum(a: list[list[int]], b: list[list[int]]) -> list[list[int]]

Precondition

a and b are square matrices n× n with n ≥ 0.

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