Question

How to count the unique elements of an array in C#

Answer 1

using System;
 
public class Program
{
    public static void Main()
    {
        int[] arr = {4, 1, 2, 8, 9, 5, 1, 7, 8, 8, 8};
        int[] frequency = new int[10];
         
        for (int i = 0; i < arr.Length; i++) {
            frequency[arr[i]]++;
        }
 
        int count = 0;
        for (int i = 0; i < 10; i++) {
            if (frequency[i] == 1)
                count++;
        }
                        
        Console.WriteLine(count);
    }
}
 
 
 
 
/*
run:
 
5
 
*/

 

 

70+ SQL courses for beginners and professionals