Sumes de matrius quadrades - P26374

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

typedef vector< vector<int> > Matriu;

Matriu suma(const Matriu& a, const Matriu& b){
    int mid=a.size();
    Matriu c(mid,vector<int>(mid));
    for(int i=0;i<mid;++i){
        for(int j=0;j<mid;++j) c[i][j]=a[i][j]+b[i][j];
    }
    return c;
}