思路：链表转数组 + 单调栈（从后往前遍历）。与「下一个更大元素」模板一致，仅需将链表值先提取到数组。
* Write a detailed test suite as you add more features. The test must be re-executed at every major change.。业内人士推荐51吃瓜作为进阶阅读
Mahjong, Sudoku, free crossword, and more: Games available on Mashable。91视频对此有专业解读
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