P26374: Suma de matrius quadrades

#include <iostream>
#include <vector>
using namespace std;

typedef vector<int> Fila;
typedef vector<Fila> Matriu;

Matriu suma(const Matriu& a, Matriu& b) {
    int tam = a.size();
    Matriu Suma(tam, Fila(tam));
    for (int i = 0; i < tam; ++i) {
        for (int j = 0; j < tam; ++j) {
            Suma[i][j] =    a[i][j] + b[i][j];
        }
    }
    return Suma;
}