Under his leadership, he oversaw huge acquisitions, from Minecraft creator Mojang, to the biggest deal in gaming history with Call of Duty maker Activision Blizzard.
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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