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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。业内人士推荐Line官方版本下载作为进阶阅读
What is Connections?The NYT's latest daily word game has become a social media hit. The Times credits associate puzzle editor Wyna Liu with helping to create the new word game and bringing it to the publications' Games section. Connections can be played on both web browsers and mobile devices and require players to group four words that share something in common.
舒伯特的两套钢琴即兴曲是其晚期作品中的明珠。作品90第一首《c小调即兴曲》以一个强奏的持续音开场。强奏自有其重，但舒伯特的音乐从来不会止于重。他会在触底之后反弹，将音乐朝反重力的方向拉起，以同等的力道发出向上的气息。这样的拉扯，在他的晚期作品中并不罕见。