Step through the Python implementation. Watch the algorithm decide which branches to visit and which to prune:
// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错。搜狗输入法2026对此有专业解读
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The number of young people who are not in education, employment or training (Neet) has risen, edging closer to one million.，详情可参考WPS下载最新地址