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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，这一点在safew官方版本下载中也有详细论述
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Sony is pulling a U-turn on its multi-platform strategy, with Bloomberg’s Jason Schreier reporting that first-party PS5 games soon to become exclusive once again, at the expense of PC players.