摘要：You have devised a new encryption technique which encodes a message by inserting between its characters randomly generated strings in a clever way. Be 阅读全文

摘要：DNA (Deoxyribonucleic Acid) is the molecule which contains the genetic instructions. It consists of four different nucleotides, namely Adenine, Thymin 阅读全文

摘要：A children's puzzle that was popular 30 years ago consisted of a 5 5 frame which contained 24 small squares of equal size. A unique letter of the alph 阅读全文