#include <iostream>
using namespace std;
#define N 5
#define M 6

int main () {
    int cont=0;
    int Negozio[N][2] = {{1, 10},
                         {2, 11},
                         {5, 4},
                         {7, 5}};

    int Magazino[N][2] = {{2, 20},
                          {3, 11},
                          {5, 7},
                          {8, 8},
                          {10, 10}};

    int Totale[M+N][2];
    int a=0, i, b=0;
    i=0;

    while (a<N or b<M) {
        if (Negozio[a][0]==Magazino[b][0] and b<M-1 and a<N-1) {
            Totale[i][0]=Negozio[a][0];
            Totale[i][1]=Magazino[b][1]+Negozio[a][1];          cout<<"a="<<a<<"   b="<<b<<endl;
            a++; b++; cont++;
        }

        if ((Negozio[a][0]>Magazino[b][0] or a==N-1) and b<M)  {
            Totale[i][0]=Magazino[b][0];
            Totale[i][1]=Magazino[b][1];                        cout<<"b="<<b<<endl;
            b++;    cont++;
        }

        if ((Negozio[a][0]<Magazino[b][0] or b==M-1) and a<N){
            Totale[i][0]=Negozio[a][0];
            Totale[i][1]=Negozio[a][1];                         cout<<"a="<<a<<endl;
            a++;    cont++;
        }
    }

    cout<<endl<<endl;
    for (int i=0; i<cont; i++) {
        for (int j=0; j<2; j++) {
            cout.width(4);
            cout<<Totale[i][j]<<" ";
        }
    cout<<endl;
    }
}