void sort3(int *pa[3]) {
    int a = *pa[0];
    int b = *pa[1];
    int c = *pa[2];

    if(a > b) {
        int z = a;
        a = b;
        b = z;
    }
    if(a > c) {
        int z = a;
        a = c;
        c = z;
    }
    if(b > c) {
        int z = b;
        b = c;
        c = z;
    }

    pa[0] = &a;
    pa[1] = &b;
    pa[2] = &c;

}