1 if (ub >= lb) 2 for (int c0 = 1; c0 <= ub; c0 += 1) 3 for (int c1 = c0; c1 <= n; c1 += 1) { 4 if (c0 >= lb && c1 >= c0 + 1) { 5 s0(c0, c1); 6 if (n >= ub + 1) 7 s2(c0, c1); 8 } else if (lb >= c0 + 1) { 9 s3(c0, c1, lb, c0, c1); 10 } 11 for (int c3 = max(lb, c0); c3 <= ub; c3 += 1) 12 s1(c0, c1, c3); 13 } 14