代码要点：倒序遍历，先算右侧再推左侧；栈内维护「右侧候选更大值」，单调递增（栈顶最小）。
BYOB (bring your own buffer) reads were designed to let developers reuse memory buffers when reading from streams — an important optimization intended for high-throughput scenarios. The idea is sound: instead of allocating new buffers for each chunk, you provide your own buffer and the stream fills it.，详情可参考heLLoword翻译官方下载
// Define what happens with the result，更多细节参见快连下载-Letsvpn下载
Graceful Fallback for Extreme Customization:，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述