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.
，详情可参考快连下载-Letsvpn下载
Our digitised version of the FT newspaper, for easy reading on any device.
Special Features
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。