void xoaCot(int**& a, int dong, int &cot, int viTriXoa)
{
	for (int j = viTriXoa; j < cot; j++)
	{
		hoanViCot(a, dong, j, j + 1);
	}
	
	for (int i = 0; i < dong; i++)
	{
		a[i] = (int*)realloc(a[i], (cot - 1) * sizeof(int));
	}
	int* temp;
	temp = (int*)malloc(dong * sizeof(int));
 
	for (int i = 0; i < dong; i++)
	{
		temp[i] = a[i][viTriXoa];
	}
	
	free(temp);
	cot--;
}