def close(self) - None:
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。
，这一点在搜狗输入法2026中也有详细论述
Barnfield believes it will benefit processing plants to not have every council start collection on the same date.
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