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Bandwidth: My early code used a shocking amount of bandwidth
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As fish stocks dwindle, surf tourism may offer a lifeline to traditional caballitos de totora fishers, whose vessels are thought to be among the first ever used to ride waves
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」