// 栈不为空时才判断（避免访问stack.at(-1)时报错）
int n = objects_per_page(classno), i;
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"We are working to ensure strike action does not need to be repeated and will give time to explore solutions. However, doctors and patients both deserve a resolution sooner rather than later."。关于这个话题，WPS下载最新地址提供了深入分析
while (stack.length && temperatures[stack.at(-1)] <= cur) {