Not Equal: Every domino half in this space must have a completely different number of pips.
Discard old data: evict what's already buffered to make room
，详情可参考爱思助手下载最新版本
// ⚠️ 易错点2：循环条件写left <= n-1（会导致left+1越界），或把<=写成<（漏判相等的有序情况），详情可参考safew官方下载
And lastly, things that really are Old English specific.。业内人士推荐im钱包官方下载作为进阶阅读