需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
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I close my eyes and picture a boat making its way towards the mainland. Lit only by moonlight, a silhouette walks towards a post box and mails three letters, one by one. Then, the familiar tune of ABBA’s Gimme! Gimme! Gimme! (A Man After Midnight) starts to play, and the musical begins.
Фото: Clodagh Kilcoyne / Reuters