Are these lines correct?

[mahjongrepository]

Are these lines correct?

[Nihisil]

Hi @ycdoit. Thanks for report. Unfortunately I don't have enough time to debug it properly and without real test cases I can't say should be your suggestions applied or not.

So, without hand examples that will fail on the original code and will pass with your changes I prefer to not change anything :)

[ycdoit]

Ok, that's fine.

But I would like to explain my changes.

1. |= does not un-check the bit, ^= actually can do this.
2. There is still one tile left when the tile count == 4, and 2 for a pair and 1 for a chow. If you use run(depth+1), you will left one tile unprocessed. It's not easy to test because in most cases, 4 tiles are used for 3 + 1, not for 2 + 1 + 1.