1 for (int c0 = M + 1; c0 <= 2 * M; c0 += 1) 2 S1(-M + c0); 3 for (int c0 = 2 * M + 1; c0 <= M + N; c0 += 1) { 4 S1(-M + c0); 5 S2(-2 * M + c0); 6 } 7 for (int c0 = M + N + 1; c0 <= 2 * M + N; c0 += 1) 8 S2(-2 * M + c0); 9