stack.pop(); // 弹出无效候选值
Defense Secretary Pete Hegseth threatened to revoke Anthropic’s $200 million contract with the U.S. military or label the company a supply-chain risk.，更多细节参见heLLoword翻译官方下载
int exchanged = 1; // 标记本轮是否发生交换，更多细节参见服务器推荐
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