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[LeetCode] Count Primes
Count Primes Description: Count the number of prime numbers less than a non-negative number, n 解题思路: 题意为求小于n的质数的个数。有两种方法: 1、naive办法,对小于n的每个数,检查是否为质数。而检查m是否为质数,需要验证是否都不能被2~pow(m, 0.5)整...
分类:其他好文   时间:2015-04-28 21:07:26    阅读次数:155
POJ1975:Median Weight Bead(FLOYD)
Description There are N beads which of the same shape and size, but with different weights. N is an odd number and the beads are labeled as 1, 2, ..., N. Your task is to find the bead whose weight ...
分类:其他好文   时间:2015-04-28 21:04:04    阅读次数:175
codeforces 292E. Copying Data
We often have to copy large volumes of information. Such operation can take up many computer resources. Therefore, in this problem you are advised to come up with a way to copy some part of a number a...
分类:其他好文   时间:2015-04-28 18:40:33    阅读次数:250
Three types of tables
TransparentPoolClusterContain a single table. Used to store master dataThey are used to hold a large number of very small tables(stores customizing da...
分类:其他好文   时间:2015-04-28 18:17:09    阅读次数:114
LeetCode-204 Count Primes
Count the number of prime numbers less than a non-negative number,n题意:求小于n的所有素数的个数。思路:1. 范围在1~n-1,求先把2的倍数删除,再把3的倍数删除,再把5的倍数删除。。。每次都把集合中最小元素的倍数删除,多次循环之...
分类:其他好文   时间:2015-04-28 17:52:50    阅读次数:112
SNRO:Number Range
业务对象是在一定的编号范围内分配编号的,编号既可以是内部分配也可以是外部分配。对于外部分配,用户输入编号,系统检查这个编号是否被占用。对于内部分配,系统会自动的把编号分配给业务对象。所以内部分配和外部分配有不同的Number range。对于编号的分配,要考虑法规要求和业务规则,比如要求编号必须是连...
分类:其他好文   时间:2015-04-28 17:48:14    阅读次数:514
[LeetCode] Happy Number
Write an algorithm to determine if a number is “happy”.A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of i...
分类:移动开发   时间:2015-04-28 16:19:46    阅读次数:156
HDOJ(1005) Number Sequence
这道题,咋一看很像Fibonacci数列,使用递归或者改进的动态规划来解决。但是仔细一看,(1 2 using namespace std; 3 int main() 4 { 5 int a,b,i; 6 long long f[55],n; 7 while(cin>>a>...
分类:其他好文   时间:2015-04-28 16:01:33    阅读次数:175
iptables删除规则
查看nat规则:iptables -t nat -nL --line-number添加规则是-A和-I,-A是添加到末尾,-I是添加到指定位置,默认添加到最前面。删除使用-D,也就是原来“iptables -A 某某某”变成“iptables -D 某某某”。但是有些规则很长,容易写错,所以删除可以...
分类:其他好文   时间:2015-04-28 15:59:13    阅读次数:108
[LeetCode] Count Primes 质数的个数
Description:Count the number of prime numbers less than a non-negative number,nclick to show more hints.References:How Many Primes Are There?Sieve of ...
分类:其他好文   时间:2015-04-28 15:35:41    阅读次数:144
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