Distinct of the given array with each element occurence, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] arr = {1,4,2,5,4,2,5,1,6,2,5,3,8,9,6 };
            int[] fr = new int[arr.Length];
            int visited = -1;
            for (int i = 0; i < arr.Length; i++)

{

int count = 1;

for (int j = i + 1; j < arr.Length; j++)

{

if (arr[i] == arr[j])

{

count++;

fr[j] = visited;

}

if (fr[i] != visited)

fr[i] = count;

}

for (int i = 0; i < fr.Length; i++)

{

if (fr[i] != visited)

Console.WriteLine(arr[i] + " Count is " + fr[i]);

}
         }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 4,67 sec, absolute running time: 0,11 sec, cpu time: 0,08 sec, average memory usage: 15 Mb, average nr of threads: 3, absolute service time: 4,81 sec