Question

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

Answer 1

#include <iostream>
  
int main()
{
    int arr[] = {4, 1, 2, 8, 9, 5, 1, 7, 8, 8, 8, 3, 3};
    int frequency [10] = {0};
    int size = sizeof(arr) / sizeof(arr[0]);
     
    for (int i = 0; i < size; i++) {
        frequency[arr[i]]++;
    }
      
    int count = 0;
    for (int i = 0; i < 10; i++) {
        if (frequency[i] == 1)
            count++;
    }
    
    std::cout << count;
          
    return 0;
}
     
     
     
     
/*
run:
     
5
       
*/

 

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