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」
era of business computing. Banks didn't miss out.
。关于这个话题，91视频提供了深入分析
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（四）以委托方名义开具发票代委托方收取的款项。