习题链接：LeetCode 402. 移掉 K 位数字
computer technology had advanced to such a state that it was obviously possible
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'During yesterday’s strongest storm in two decades, there was plenty of red glow. It felt as if we were literally sailing inside that light,' Kud-Sverchkov wrote on his Telegram channel on 20 January
"The entire sequence of Artemis flights needs to represent a step-by-step build-up of capability, with each step bringing us closer to our ability to perform the landing missions. Each step needs to be big enough to make progress, but not so big that we take unnecessary risk given previous learnings."