方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
Most architectures have specialised instructions for stack allocation,，这一点在im钱包官方下载中也有详细论述
，更多细节参见搜狗输入法2026
Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).，详情可参考旺商聊官方下载
if (pending.length 0) yield [pending];
# -- User setup --