Original OSM: ~2.07 billion points, ~2.42 billion edges
Less Than (6): Everything in this space must be less than 6. The answer is 1-3, placed horizontally.
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* 核心思路：链表转数组 + 单调栈（从后往前遍历），时间复杂度O(n)，空间复杂度O(n)