stack.pop(); // 弹出无效元素
// 边界处理：0辆车返回0，1辆车返回1（无需后续计算）
，这一点在safew官方下载中也有详细论述
In the 18 January incident, protesters interrupted a service in the church by chanting "ICE out" and "Justice for Renee Good", the mother of three who was fatally shot by a US Immigration and Customs Enforcement (ICE) officer last month in Minneapolis.
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