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HDOJ 1391 Number Steps(打表DP)

Problem Description Starting from point (0,0) on a plane, we have written all non-negative integers 0, 1, 2,… as shown in the fig

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HDOJ(HDU) 2136 Largest prime factor(素数筛选)

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

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HDOJ(HDU) 2138 How many prime numbers(素数-快速筛选没用上、)

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

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HDOJ(HDU) 2520 我是菜鸟,我怕谁(等差数列)

Problem Description lin2144是一只小菜鸟,都是笨鸟先飞,lin2144想来个菜鸟先飞,他从0点出发 一开始的飞行速度为1m/s,每过一个单位时间lin2144的飞行速度比上一个单位时间的飞行速度快2m/s,问n (0 < n < 1

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HDOJ(HDU) 2521 反素数(因子个数~)

Problem Description 反素数就是满足对于任意i(0< i < x),都有g(i) < g(x),(g(x)是x的因子个数),则x为一个反素数。现在给你一个整数区间[a,b],请你求出该区间的x使g(x)最大。 Input 第一行输入n,接下

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