背包dp lgP1802: https://www.luogu.com.cn/blog/shenhy1205/solution-p1802 lgP2113: https://www.luogu.com.cn/blog/shenhy1205/solution-p2113 NOIP2018-S D1T2:https://www.luogu.com.cn/blog/shenhy1205/solution-p5020