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for (int c0 = 1; c0 <= M; c0 += 1) { for (int c1 = 1; c1 <= min(M, c0 + 1); c1 += 1) S1(c0, c1); if (c0 + 1 >= M) { S2(c0, c0 + 2); } else { S1(c0, c0 + 2); S2(c0, c0 + 2); } for (int c1 = c0 + 3; c1 <= M; c1 += 1) S1(c0, c1); }