Hurdle Word 4 answerTERRA
Part of a Soviet-era spacecraft is likely to have re-entered the Earth's atmosphere after being stuck in orbit for more than half a century, the European Space Agency said.
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Alternative verification，这一点在服务器推荐中也有详细论述
// 3. 计算当日跨度：跨度 = 当前索引 - 上一个更大值的索引（栈空则为i+1）