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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Yungblud festival goes international, but not everyone's convinced
Aside from keeping devices powered up efficiently, the GoCable includes hidden tools for extra convenience. You’ll have quick access to a bottle opener and a hidden cutter for opening packages safely. The included carabiner clip lets you attach this to bags or belts in seconds, so you can always keep it within arm’s reach.