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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」
。关于这个话题，heLLoword翻译官方下载提供了深入分析
FT App on Android & iOS。服务器推荐对此有专业解读
Greater than: Every domino half in this space must add up to more than the number.
let minVal = Infinity;