78 - ZOJ Monthly, May 2009 - E
You, the best hacker in the world, want to download the books published on Google Book. After some investigation, you found that the address of each page consists of two parts. The first part is the page number, the second part is the signature which is unique for each page. To get the signature, you can send the query to the server. The query has one parameter, which indicates the page number. The server will return the signature of the required page, and it may also return the signature of some adjacent pages.
To minimize the bytes downloaded from the internet, and also make the server adminstrator hard to notice your "hack", you'd like to minimize the number of queries
The input has multiple cases.
Results should be directed to standard output. The output of each test case should be a single integer, which is the minimum number of queries to get all the signatures.
2 3 1 1 2 2 3 3 3 1 1 1 3 3 3
Author: FAN, Xiang
Source: ZOJ Monthly, May 2009