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:
difficulty, and CPC.
，这一点在safew官方版本下载中也有详细论述
Immediately after boot, we can see that anaconda starts without asking us any questions.
他们不再满足于“打卡式”的短途游，愿意为独特的航线、更长的航程和更精致的船上体验支付溢价。这也是还在坚持深耕中国邮轮市场的船公司最想看到的。
* @return pivot最终位置