They plan to manufacture material for semiconductors, which can be used back on Earth in electronics in communications infrastructure, computing and transport.
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）
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We continue to advise affected customers…
In less than 25 years this will rise to more than half of the rail network being at risk, according to the government's own figures.
Фото: Ilya Moskovets / Global Look Press