When they began their first attempt of the walk, they were waved off by members of the local air ambulance crew.
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方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
3014248310http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142483.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142483.html11921 让农民生活更加富裕美好