void sorter(int *first, int *last)
{
	while (first < --last) {
		for (int *p = first; p < last; ++p) {
			if (p[1] < p[0]) {   //if p[0] and p[1] in wrong order,
				const int temp = p[0];   //swap them
				p[0] = p[1];
				p[1] = temp;
			}
		}
	}
}