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。
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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From a very young age, Eileen Collins wanted to be an astronaut
The recall affects the Ford Maverick (model years 2022–2026), Ford Ranger (MY 2024–2026), Ford Expedition (MY 2022–2026), Ford E-Transit (MY 2026), Ford F-150 (MY 2021–2026), Ford F-250 SD (MY 2022–2026), and the Lincoln Navigator (MY 2022–2026). Just the F-150s alone number 2.3 million.
Орбан вслед за Фицо обрушился с критикой на ЗеленскогоОрбан вслед за Фицо обвинил Зеленского во лжи о трубопроводе «Дружба»