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// 易错点4：仅处理栈非空的情况，忽略栈空的情况 → 栈空时res[i]会是undefined
But the capsule suffered several technical problems during its journey to the space station, and it was deemed too risky to take the astronauts home.
Note that you do not have to use int and you should not
建设单位：西安保亿名筑置业有限公司（企业法人：乔爱军，项目负责人：姚波）；施工单位：南通建工集团股份有限公司（企业法人：张向阳，项目经理：胥蜀）；监理单位：正博工程管理有限公司（企业法人：郑波，总监理工程师：翁召）