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poj 3292 Semi-prime H-numbers
题意:一个H-number是所有的模四余一的数,如 1,5,9,13,17,21... H-primes数是H-number数(1除外),且它的H-number因子除了1只有它本身,如5,9,13,17,21... 但65是H-number数,却不是H-primes数,因为 65=5*13. H-semi-prime是H-number数,且等于2个H-primes的乘积.如65 给你一个数n,问1到n有多少个H-semi-prime数 分析:用筛选法的思想,将H-primes筛选出来,同时标记在范围内两个H...
分类:其他好文   时间:2014-09-13 17:20:06    阅读次数:247
[LeetCode]Next Permutation
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible...
分类:其他好文   时间:2014-09-13 09:26:54    阅读次数:160
JS中的“==”符号及布尔值转换规则
what are the rules for how == converts types?关于"=="的比较规则:1. Comparing numbers and strings will always convert the strings to numbers.number类型与string类型...
分类:Web程序   时间:2014-09-13 00:38:34    阅读次数:369
组合数学 - 置换群的幂运算 --- poj CARDS (洗牌机)
CARDSTime Limit:1000MSMemory Limit:10000KTotal Submissions:1448Accepted:773DescriptionAlice and Bob have a set of N cards labelled with numbers 1 ... ...
分类:其他好文   时间:2014-09-11 22:07:02    阅读次数:183
codeforces Restore Cube(暴力枚举)
1 /* 2 题意:给出立方体的每个顶点的坐标(是由源坐标三个数某几个数被交换之后得到的!), 3 问是否可以还原出一个立方体的坐标,注意这一句话: 4 The numbers in the i-th output line must be a permutation o...
分类:其他好文   时间:2014-09-11 16:56:02    阅读次数:157
Leetcode dfs&dp Triangle
Triangle  Total Accepted: 17536 Total Submissions: 65508My Submissions Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row...
分类:其他好文   时间:2014-09-11 07:42:01    阅读次数:194
找出数组中特定和数字下标(JAVA)
比如:输入:numbers={2, 7, 11, 15}, target=9输出:index1=1, index2=2 1 public class _003TwoSum { 2 3 public static void main(String[] args) { 4 in...
分类:编程语言   时间:2014-09-10 23:41:01    阅读次数:315
usaco-3.1-humble-pass
这个,用set:/*ID: qq104801LANG: C++TASK: humble*/#include #include #include #include #include #include #include #include #include #include using namespace...
分类:其他好文   时间:2014-09-10 01:34:19    阅读次数:213
TapeEquilibrium (Codility)
A non-empty zero-indexed array A consisting of N integers is given. Array A represents numbers on a tape.Any integer P, such that 0 &A);that, given a....
分类:其他好文   时间:2014-09-09 22:44:39    阅读次数:482
Sum Root to Leaf Numbers <leetcode>
Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a number.An example is the root-to-leaf path1->2->3which rep...
分类:其他好文   时间:2014-09-09 21:27:19    阅读次数:194
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