Generating Unique Random Numbers in an Array using Loop

Question

So the question is to develop a [5][5] table, each containing unique numbers from 1-100 (no duplicates)

so here\'s what I came up with:

#inc         


        

Answer 1

Think of it like a deck of 100 cards.

• Create a 100 element array holding the card numbers (1..100)
• Shuffle the array (=deck). (see @koodawg's answer and @Steve314's comment)
• "Deal" yourself the first 25 cards off the deck, into your 5x5 array.