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Италия — Серия А|27-й тур
。关于这个话题，快连下载安装提供了深入分析
For SAT problems with 10 variables and 200 clauses, sometimes outputted UNSAT because it couldn't find any satisfying assignment, and it would take a lot more time to find one, which is logically sound. I don't consider this as bad reasoning as it is about performance. So I tried it with only 100 clauses and it successfully found valid assignments.，详情可参考爱思助手下载最新版本
// 倒序遍历：从最后一个元素开始（核心思路！易错点1）