Not far from their minds is the reality that China is also attempting to land its own crew on the moon before 2030 and may be able to get there before the United States. NASA hasn't sent humans to the lunar surface since Apollo 17 in 1972. And though no other nation has followed in the giant leap for humankind, that won't always be true.
2. 排序：将堆顶(最大值)与末尾交换，堆大小-1，重新调整堆
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Four astronauts will head around the Moon for the Artemis II mission