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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Crowborough Shield, a group of concerned residents, launched a legal challenge after securing more than £100,000 for legal fees with crowdfunding, after a government announcement about using Crowborough army training camp as accommodation for asylum seekers.
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"I'm pretty comfortable with the aspiration to be in a unique special relationship as long as we remember it needs to be created," he says.