public static int FindFreqNumber(int[] arr) {
for (int i = 0; i < len - size; i++)
if (arr[i] == arr[i + size])
public static void Main()
Console.WriteLine("UniLecs");
Console.WriteLine(FindFreqNumber(new int[] { 1, 3, 3, 7, 7, 7, 7, 8, 10 }));
Console.WriteLine(FindFreqNumber(new int[] { 1, 2 }));