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freopen("input1.txt", "r", stdin);
    int i = 0;
    while (cin >> buying1[i] >> selling1[i])
    {
        index1[i]=i;
        i++;
    }
    cout << "--------------------------------" << endl;

    maxIndex1 = i;
    fclose(stdin);
    freopen("input2.txt", "r", stdin);
    i = 0;
    while (cin >> buying2[i] >> selling2[i])
    {
        index2[i]=i;
        i++;
    }
    cout << "--------------------------------" << endl;

    maxIndex2 = i;
    fclose(stdin);
    freopen("input3.txt", "r", stdin);
    i = 0;
    while (cin >> buying3[i] >> selling3[i])
    {
        index3[i]=i;
        i++;
    }
    cout << "--------------------------------" << endl;
    maxIndex3 = i;