需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
The Department of Defense had threatened to cancel a $200m contract and deem Anthropic a “supply chain risk”, a designation with serious financial implications, if the company did not comply with the request by Friday.
。关于这个话题，safew官方版本下载提供了深入分析
An appearance in Minneapolis, Minnesota, on Saturday, 28 February, has also been postponed.。51吃瓜对此有专业解读
At least 15 killed after military plane carrying banknotes crashes in Bolivia
Овечкин продлил безголевую серию в составе Вашингтона09:40