More elegant way to check for duplicates in C++ array?

Question

I wrote this code in C++ as part of a uni task where I need to ensure that there are no duplicates within an array:

// Check for duplicate numbers in user in         


        

Answer 1

#include
#include

int main(){

    int arr[] = {3, 2, 3, 4, 1, 5, 5, 5};
    int len = sizeof(arr) / sizeof(*arr); // Finding length of array

    std::sort(arr, arr+len);

    int unique_elements = std::unique(arr, arr+len) - arr;

    if(unique_elements == len) std::cout << "Duplicate number is not present here\n";
    else std::cout << "Duplicate number present in this array\n";

    return 0;
}