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projecteuler---->problem=5----Smallest multiple n个数求最小公倍数
title: 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of the nu...
分类:其他好文   时间:2014-06-07 01:27:37    阅读次数:229
projecteuler---->problem=4----Largest palindrome product
title: Largest palindrome product Problem 4 A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 99. Find the l...
分类:其他好文   时间:2014-06-07 01:24:27    阅读次数:398
projecteuler---->problem=7----10001st prime
title: By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10 001st prime number? 翻译: 通过列出前6个质数,我们可知第6个质数是13。 那么第10001个质数是...
分类:其他好文   时间:2014-06-05 12:28:28    阅读次数:277
projecteuler---->problem=6----Sum square difference
title: The sum of the squares of the first ten natural numbers is, 12 + 22 + ... + 102 = 385 The square of the sum of the first ten natural numbers is, (1 + 2 + ... + 10)2 = 552 = 3025 Hence ...
分类:其他好文   时间:2014-06-05 12:03:29    阅读次数:243
hdu 1016 Prime Ring Problem (dfs)
一切见注释。 #include #include #include #include using namespace std; bool vis[22]; int n; int ans[22]; int top; bool isprime(int x)//判断素数 { for(int i=2;i<x;i++) if(x%i==0)return false; ...
分类:其他好文   时间:2014-06-05 08:26:47    阅读次数:201
NYOJ43 24 Point game 【回溯】
24 Point game 时间限制:3000 ms  |  内存限制:65535 KB 难度:5 描述 There is a game which is called 24 Point game. In this game , you will be given some numbers. Your task is to find an expressi...
分类:其他好文   时间:2014-06-04 21:06:57    阅读次数:295
Terrible Sets
Terrible SetsTime Limit:1000MSMemory Limit:30000KTotal Submissions:3017Accepted:1561DescriptionLet N be the set of all natural numbers {0 , 1 , 2 , . ...
分类:其他好文   时间:2014-05-31 22:01:28    阅读次数:325
CodeForces 432C Prime Swaps
DescriptionYou have an arraya[1],?a[2],?...,?a[n], containing distinct integers from1ton. Your task is to sort this array in increasing order with the...
分类:其他好文   时间:2014-05-31 01:35:23    阅读次数:318
ProjectEuler 009题
题目:A Pythagorean triplet is a set of three natural numbers, a b c, for which,a2 + b2 = c2For example, 32 + 42 = 9 + 16 = 25 = 52.There exists exactl.....
分类:其他好文   时间:2014-05-31 01:23:03    阅读次数:254
素数筛
这是我目前知道的打素数表最快的方法了………… 差不多是O(n)的,100000以内花了0.005秒。 1 int prime[100005], np, vis[100005]; 2 3 void get_prime(int n){ 4 mset(prime); mset(vis); 5 ...
分类:其他好文   时间:2014-05-30 23:26:36    阅读次数:204
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