1 for (int c0 = 1; c0 <= 2; c0 += 1) 2 for (int c1 = 1; c1 <= M; c1 += 1) 3 S1(c0, c1); 4 for (int c0 = 3; c0 <= N; c0 += 1) { 5 for (int c1 = 1; c1 <= min(M, c0 - 1); c1 += 1) 6 S1(c0, c1); 7 if (M >= c0) { 8 S1(c0, c0); 9 S2(c0, c0); 10 } 11 for (int c1 = c0 + 1; c1 <= M; c1 += 1) 12 S1(c0, c1); 13 if (c0 >= M + 1) 14 S2(c0, c0); 15 } 16