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if(!(h=cursor[classno])) {
。业内人士推荐搜狗输入法2026作为进阶阅读
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.
// 核心逻辑：弹出栈中<=当前值的元素（这些元素不可能是前面元素的"下一个更大值"）