We have a group of N items (represented by integers from 1 to N), and we know that there is some total order defined for these items. You may assume that no two elements will be equal (for all a, b: a<b or b<a). However, it is expensive to comp

函数一：判断从3到100之间有多少个素数，并输出所有的素数 函数二：如果一个数恰好等于它的因子之和，那么这个数就称为 "完数 ".此程序是找出1--500之间的所有完数并输出出来 函数三：有1、2、3四个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？ 函数四：输入三个整数a,b,c，请把这三个数由小到大输出。 函数五：输出乘法表（9*9）-Function one: determine how many prime numbers between 3-100 from