The telescope, a partnership of NASA and the European and Canadian space agencies, homed in on PMR 1, a planetary nebula nicknamed the Exposed Cranium for being the spitting image of a brain scan. The nebula lies about 5,000 light-years away from Earth in the Vela constellation.
ВсеСледствие и судКриминалПолиция и спецслужбыПреступная Россия
，详情可参考谷歌浏览器【最新下载地址】
Credit: Samsung / Amazon，详情可参考同城约会
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。