В Финляндии предупредили об опасном шаге ЕС против России09:28
Less than: Every domino half in this space must add up to less than the number.
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思路:倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引,仅当 i < len 时记录答案。