We use Git here at interviewstreet. Using Git, branching, testing and reverting is so easy. Almost all commands are simple and easy to remember in Git, except for deleting a remote branch. The command to delete a remote branch “feature1” is git push origin :feature1 Just wanted to note this down.
The problem statement is as follows : The Playfair Cipher encrypts text by substitution of digrams (2-letter groupings). It is traditional to use a 5 x 5 letter scrambled-alphabet key square for the encryption and decryption. Each letter of the alphabet appears once, except “I” also represents “J”. The arbitrarily chosen key word, “CODES” comes first, then all the rest …