// n    - number to count digits in
// x[]  - pointer to output array with digits
void digitsCount(int n, int* &x)
{
    x = new int[10];
    for (int i=0; i<10; i++) x[i] = 0;

    for (int i = 1; i <= n; i++)
    {
        stringstream ss;
        ss << i;
        string str = ss.str();
        for (int j = 0; j < str.length(); j++)
        {
            char c = str[j];
            int d = atoi(&c);
            x[d]++;
        }
    }
}