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Fibonacci again and again 任何一个大学生对菲波那契数列(Fibonacci numbers)应该都不会陌生，它是这样定义的： F(1)=1; F(2)=2; F(n)=F(n-1)+F(n-2)(n>=3); 所以，1,2,3,5,8,13……就是菲波那契数列。 在HDOJ 阅读全文
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推论：小于N且与N互质的所有数的和（包括1）为 N*vola（N）/2 Given a positive integer N, your task is to calculate the sum of the positive integers less than N which are not c 阅读全文
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The input contains N natural (i.e. positive integer) numbers ( N <= 10000 ). Each of that numbers is not greater than 15000. This numbers are not nece 阅读全文
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The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians 阅读全文
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原题链接http://codeforces.com/contest/897/problem/C What are you doing at the end of the world? Are you busy? Will you save us? 原题链接http://codeforces.com/ 阅读全文
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While Vasya finished eating his piece of pizza, the lesson has already started. For being late for the lesson, the teacher suggested Vasya to solve on 阅读全文
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Recenlty Luba got a credit card and started to use it. Let's consider n consecutive days Luba uses the card. She starts with 0 money on her account. I 阅读全文
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lily的好朋友xiaoou333最近很空，他想了一件没有什么意义的事情，就是统计一篇文章里不同单词的总数。下面你的任务是帮助xiaoou333解决这个问题。 Input有多组数据，每组一行，每组就是一篇小文章。每篇小文章都是由小写字母和空格组成，没有标点符号，遇到#时表示输入结束。Output每组 阅读全文
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4009: Doges 题目描述 在一个遥远的地方，住着n只 Doge，它们分别被编号为1到n之间的正整数。 有一天，一个叫 Jrisme 的人来到这里，进行了一些「虐狗」行为。具体的，Jrisme 每次会虐编号连续的一些 Doge。现给出每次虐狗的区间，求最幸运（被虐次数最多）Doge 被虐了多少 阅读全文
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Crossing River A group of N people wishes to go across a river with only one boat, which can at most carry two persons. Therefore some sort of shuttle 阅读全文