DescriptionSudoku is a very simple task. A square table with 9 rows and 9 columns is divided to 9 smaller squares 3x3 as shown on the Figure. In some of the cells are written decimal digits from 1

DescriptionThe ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices. — It i

Little Petya is now fond of data compression algorithms. He has already studied gz, bz, zip algorithmsand many others. Inspired by the new knowledge, Petya is now developing the new compression alg