试做专题

20180516 CF试做2

今天晚上比赛就做了一个题目,其他题目看了看都没有思路。先说一下做的这个题目,一开始读错题意,卡了好久,一直没搞懂是什么意思,后来才明白: A - Robbery传送门: 点击打开链接 It is nighttime and Joe the Elusive got into the country's main bank's safe. The safe has n cells pos