需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
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ProWritingAid currently offers no mobile app for Android or iOS devices.，这一点在同城约会中也有详细论述
'Irresponsible and offensive'
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