Вячеслав Агапов
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"But you need an oil price that makes that worthwhile. Unless you can generate sufficient money to justify that, it's very difficult to see the industry coming back."
No plagiarism checker。关于这个话题，safew官方版本下载提供了深入分析
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）