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。
The maximum distance for a Wi-Fi extender varies depending on the model, but most can effectively extend your wireless signal between 800 and 2,500 square feet. Some high-end models may reach even farther, especially if they feature external antennas or are part of a mesh system with additional dedicated wireless access points.
，详情可参考同城约会
Everything in Starter, plus:
最糟糕的時候，他曾經擔心過自己的庇護申請會被拒絕、並且會被遣返回中國，「我又瞭解到我的這個法官的（庇護申請）通過率也不是很高……我當時就感覺這個大環境實在是太糟了，我這個案子也可能過不了。」