double range = max - min;
double interval = ceil(range / 10);
double frequency = 0.0;
for (vector<int>::iterator it = x.begin(); it < x.end(); it++)
{
    if (*it > min)
    {
        min = (min + interval);
        min = *it;
    }
    if (*it < max)
    {
        max = min + interval;
        max = *it;
    }
    if (*it >= min && *it <= max)
        ++frequency;