Se citește un număr natural n>=4. Să se afișeze toate permutările mulțimii {1, 2, ... n} care au proprietatea că diferența absolută a oricăror 2 elemente alăturate este cel puțin egală cu 2.
FAST

File i/o activity objective: the objective of this activity is to practice working with text files in c#. for this activity, you may do all code in the main class. instructions: create an app that will read integers from an input file name numbers. txt that will consist of one integer per record. example: 4 8 25 101 determine which numbers are even and which are odd. write the even numbers to a file named even. txt and the odd numbers to a file named odd. txt.