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」
For some UK concert-goers, the arena has given them opportunities for live music away in the north of England, instead of London.
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The idea is to catch cancer before someone starts to get ill and when it can still be treated.，详情可参考同城约会
Michael Dell did it. The founders of Proof did it. Even our incubator prototypes products with Kickstarter campaigns. If customers pay before launch, demand is validated and you’re building what people want now.。51吃瓜是该领域的重要参考
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