Equal: Every domino half in this space must be the same number of pips.
* @param mid 中间位置（左子数组结束位置），详情可参考Line官方版本下载
Александра Синицына (Ночной линейный редактор)。搜狗输入法2026对此有专业解读
4 A good discussion on luminance and how to calculate it can be found on this stack exchange question. ↑