需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
Trained — weights learned from data by any training algorithm (SGD, Adam, evolutionary search, etc.). The algorithm must be generic — it should work with any model and dataset, not just this specific problem. This encourages creative ideas around data format, tokenization, curriculum learning, and architecture search.
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minVal = Math.min(minVal, nums[i]);