Sum of square matrices

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.

Problem information

Author: Unknown
Translator: Carlos Molina

Generation: 2026-01-25T10:28:55.253Z

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