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// 逻辑：这些数比当前元素小/相等，不可能成为「左侧元素的下一个更大值」，直接移除
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// 步骤3：计算初始无序区间[left, right]的最大值和最小值。关于这个话题，WPS下载最新地址提供了深入分析
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: