1 for (int c0 = 1; c0 <= N; c0 += 1) 2 S1(c0); 3 for (int c0 = N + 1; c0 <= 2 * N; c0 += 1) 4 for (int c1 = 1; c1 <= N; c1 += 1) 5 S2(c1, -N + c0); 6 for (int c0 = 2 * N + 1; c0 <= M + N; c0 += 1) { 7 for (int c1 = 1; c1 <= N; c1 += 1) 8 S3(c1, -2 * N + c0); 9 for (int c1 = 1; c1 <= N; c1 += 1) 10 S2(c1, -N + c0); 11 } 12 for (int c0 = M + N + 1; c0 <= M + 2 * N; c0 += 1) 13 for (int c1 = 1; c1 <= N; c1 += 1) 14 S3(c1, -2 * N + c0); 15