Question

How to count the total duplicate elements in int array using C

Answer 1

#include <stdio.h>

int count_duplicates(int arr[], int arr_size) {
    int dup_count = 0;

    for (int i = 0; i < arr_size; i++) {
       for(int j = i + 1; j < arr_size; j++) {
            if(arr[i] == arr[j]) {
                dup_count++;
                break;
            }
       }
    }
    
    return dup_count;
}

int main()
{
    int arr[] = {1, 2, 3, 4, 4, 5, 7, 8, 8, 9, 9}; 
    int arr_size = sizeof(arr)/sizeof(arr[0]);

    printf("%i\n", count_duplicates(arr, arr_size));

    return 0;
}



/*
run:

3

*/

 

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