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」
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"Families have described to me good experiences, terrible experiences. It is patchy, it is inconsistent and what this investigation is about, is trying to find out the things that move us from poor and bad to good and excellent.
The United States women’s hockey team has a date with Flavor Flav in Las Vegas in July to celebrate winning the gold medal at the Milan Cortina Olympics.