How to make Caounting sort with random numbers and Time executation

[Diellza]

I want to make this code with random numebr array and time executation? Does anybady nows how can I do?

#include <iostream>

using namespace std;

void print(int a[], int sz) {
    for (int i = 0; i < sz;  i++ ) cout << a[i] << " ";
    cout << endl;
}

void CountingSort(int arr[], int sz) {
    int i, j, k;
    int idx = 0;
    int min, max;

    min = max = arr[0];
    for(i = 1; i < sz; i++) {
        min = (arr[i] < min) ? arr[i] : min;
        max = (arr[i] > max) ? arr[i] : max;
    }

    k = max - min + 1;
    /* creates k buckets */
    int *B = new int [k]; 
    for(i = 0; i < k; i++) B[i] = 0;

    for(i = 0; i < sz; i++) B[arr[i] - min]++;
    for(i = min; i <= max; i++) 
        for(j = 0; j < B[i - min]; j++) arr[idx++] = i;

    print(arr,sz);

    delete [] B;
}

int main()
{
    int a[] = {5,9,3,9,10,9,2,4,13,10};
    const size_t sz = sizeof(a)/sizeof(a[0]);
    print(a,sz);
    cout << "----------------------\n" ;
    CountingSort(a, sz);
}

[Diellza]

Here is the code for time executation, but I don't know were to put this code

clock_t tn, tp;

        srand(time(NULL));

        tn = clock();
        tp = clock();