Statement

After playing Portal, Giorgio decided to open his own Enrichment Center and be like GLaDOS in real life. In this kind of research facility, test subjects are locked into chambers and faced with several dangerous puzzles, which need to be solved to gain access to the exit (and to another even riskier chamber). Obviously, there are annoying laws about human rights that would interfere with a faithful implementation of this concept; but Giorgio already planned to get around that by building a very small (and cheap!) Enrichment Center designed for lab rats. Of course, lab rats are not exceptionally smart so the puzzles need to be fairly straightforward. In the first test chamber, Giorgio is planning to arrange into a grid H × W some blocks of the following types: (1) plain floor, represented by `.'; (2) walls, represented by `#'; (3) exits, represented by `O'; (4) transparent glue, represented by `@'...