提交之后显示Runtime Error
(ACCESS_VIOLATION)      求助！
#include"iostream"
using namespace std;
int main()
{
    int n,count;
    while (cin >> n)
    {
        fflush(stdin);
        count = 0;
        char **p;
        p = (char **)calloc(n, sizeof(char));
        for (int i = 0; i < n; i++)
            p[i] = (char *)calloc(100, sizeof(char));
        for (int i = 0; i < n; i++)
        {
            gets(p[i]);
            fflush(stdin);
        }
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; p[i][j] != '\0'; j++)
            {
                if (p[i][j] >= '0' && p[i][j] <= '9')
                    count++;
            }
            cout << count << endl;
            count = 0;
        }
    }
}