SAT (short for "satisfiability") is a logic problem that given a boolean formula, it asks whether the boolean formula has an assignment that makes the problem true. An example boolean formula is:
// 易错点2：条件写成`<`而非`<=` → 相同身高的人会被错误保留，导致count统计少
，这一点在91视频中也有详细论述
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While they fly around the far side of the Moon, the crew will have three hours dedicated to lunar observation - to gaze, take images and to study its geology, which will help plan and prepare for a future landing at the Moon's south pole.