Problem Description One day, winnie received a box and a letter. In the letter, there are three integers and five operations(+,-,*,/,%). If one of the three i...

Problem Description Give you a lot of positive integers, just to find out how many prime numbers there are.

Problem Description Everybody knows any number can be combined by the prime number. Now, your task is telling me what position of the largest prime factor. ...

Problem Description We once did a lot of recursional problem . I think some of them is easy for you and some if hard for you. Now there is a very easy probl...

Problem Description In this problem you need to make a multiply table of N * N ,just like the sample out. The element in the ith row and jth column should be ...

Problem Description 有一天, KIKI 收到一张奇怪的信, 信上要KIKI 计算出给定数各个位上数字为偶数的和. eg. 5548 结果为12 , 等于 4 + 8

Problem Description 在上一回，我们让你猜测海东集团用地的形状，你猜对了吗？不管结果如何，都没关系，下面我继续向大家讲解海东集团的发展情况： 在最初的两年里，HDU发展非常迅速，综合各种ACM算法生成的老鼠药效果奇好，据说该...

Problem Description 经过慎重的考虑，XHD,8600, LL，Linle以及RPG等ACM队员集体退役，甚至正在酝酿退学。 为什么？要考研？那也不用退学呀… 当然不是！真正的原因是他们想提前创业，想合伙成立一家公司，据说公司的名称都想好了...

Problem Description As far as we known,there are so many people in this world,expecially in china.But many people like LJ always insist on that more people mo...

Problem Description 妈妈每天都要出去买菜，但是回来后，兜里的钱也懒得数一数，到底花了多少钱真是一笔糊涂帐。现在好了，作为好儿子（女儿）的你可以给她用程序算一下了，呵呵。...