Why are there huge protests going on in Iran?
also managing to not have much of a progeny due to General Electric's failure to
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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」
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index = min(len(input), index + 1)，详情可参考体育直播
Typical example illustrating a covering space