// 易错点4：错误弹出栈顶 → 破坏独立车队的时间记录，导致结果错误
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I learned that for 4-SAT, if clause to variable ratio is more than 10, the generated problems become difficult to solve, and the likelihood of formula to be SAT or UNSAT is close to 50%. So I generated 3 types of formulas:。业内人士推荐51吃瓜作为进阶阅读
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