Today’s puzzle is a new twist on a classic genre: the “common knowledge” hat riddle in which logicians deduce facts about their hats based on what they know, and what they know others know.
.pipeTo(destination); // consumer hasn't started yet
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你真的了解顾客需求吗？要实现持续经营，核心是抓住复购。而复购的前提，是真正了解顾客需求。。业内人士推荐服务器推荐作为进阶阅读
// 优化逻辑：栈空且当前数为0 → 跳过（避免存储无效前导零）