// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
这些年，越来越多普通人开始了文学写作。这本是人类精神表达的原生渴求，但大多数人往往止步途中。从“欲写”到“落笔”，需要克服惰性；从“完篇”到“臻善”，更是一场艰难跋涉。
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Synchronous fast paths matter
How exactly horses produce that distinctive sound – also called a neigh – has long eluded scientists.
There's lots of Moon on display tonight, so plenty of opportunity to do some Moon gazing. With just your naked eye, you'll be able to see the Mares Tranquillitatis, Vaporum and Serenitatis. With binoculars you'll also be able to see the Mare Nectaris, and the Alphonsus and Endymion Craters, and with a telescope you'll see also see he Apollo 16 and 11 landing spots, and the Rupes Altai.