Sum of square matrices P26374

Statement

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]]`

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

Information