需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。
事实上，龙先生的母亲在5年前曾被一个理财产品骗了5万元，家里至今还堆放着很多她从网上购买的保健品。“我觉得我不能控制老人的财产，这样不是很好。”龙先生说，其实母亲对大额资金没什么概念，反倒成天计较着三两块的小钱。
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（四）代替他人或者让他人代替自己参加考试的。，详情可参考同城约会
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