Random slot algorithm

Question

I have two dimensional array. I want to pick a slot at random, and continue to do so never picking the same slot twice until I have finally picked all slots (so nothing ran

Answer 1

Using the Fisher-Yates shuffle algorithm as mentioned before (in O(n) time)

int X = 3;  int Y = 4;
int[] array = new int[X * Y];

for (int i = 0; i < array.Length; i++) array[i] = i;
FisherYatesShuffle(array);

var randomSlots = array.Select((i,j) => new {x=array[j]%X , y=array[j]/X })
                       .ToArray();

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public static void FisherYatesShuffle(T[] array)
{
    Random r = new Random();
    for (int i = array.Length - 1; i > 0; i--)
    {
        int j = r.Next(0, i + 1);
        T temp = array[j];
        array[j] = array[i];
        array[i] = temp;
    }
}