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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:
，这一点在51吃瓜中也有详细论述
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// 3. 对每个桶排序 + 收集结果