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HNU 12876 Quite Good Numbers 完美数变形
筛法是一种很快的方法,贴代码纪念一下。 做法很像筛法 1 #include 2 #include 3 #include 4 #include 5 #include 6 #include 7 #include 8 #include 9 #include 10 #include 11 #...
分类:其他好文   时间:2014-08-10 10:19:50    阅读次数:223
cf55dBeautiful numbers数位dp
想到 最小公倍数 其余的就好搞了 ,可是没想到#include #include #include #include #include #include #include #include #include #include #include #include #includeusing names...
分类:数据库   时间:2014-08-09 23:11:49    阅读次数:313
Balanced Numbers数位dp
三进制搞下, 0 表示没出现过, 第i位为1 表示 i出现了奇数次, 2表示i 出现了偶数次。#include #include #include #include #include #include #include #include #include #include #include #inc...
分类:其他好文   时间:2014-08-09 23:07:59    阅读次数:325
UVA 401-- Palindromes--串处理
Palindromes  A regular palindrome is a string of numbers or letters that is the same forward as backward. For example, the string "ABCDEDCBA" is a palindrome because it is the same when t...
分类:其他好文   时间:2014-08-09 21:36:09    阅读次数:344
Minimum Inversion Number
Problem Description The inversion number of a given number sequence a1, a2, ..., an is the number of pairs (ai, aj) that satisfy i aj. For a given sequence of numbers a1, a2, ..., an, if we move t...
分类:其他好文   时间:2014-08-09 18:48:38    阅读次数:241
poj 1845(等比数列前n项和及快速幂)
Sumdiv Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 13959   Accepted: 3433 Description Consider two natural numbers A and B. Let S be the sum of all natur...
分类:其他好文   时间:2014-08-09 11:43:07    阅读次数:226
POJ - 1392 Ouroboros Snake (欧拉回路的应用)
Description Ouroboros is a mythical snake from ancient Egypt. It has its tail in its mouth and continously devours itself. The Ouroboros numbers are binary numbers of 2^n bits that have the prop...
分类:其他好文   时间:2014-08-09 11:40:57    阅读次数:315
[LeetCode: 题解] Combination Sum
Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same repeate...
分类:其他好文   时间:2014-08-08 20:54:46    阅读次数:246
B - Phone List
Description Given a list of phone numbers, determine if it is consistent in the sense that no number is the prefix of another. Let’s say the phone catalogue listed these numbers: 1. Emergency 911 ...
分类:其他好文   时间:2014-08-08 12:49:16    阅读次数:187
POJ 3641 Pseudoprime numbers 米勒罗宾算法
链接:http://poj.org/problem?id=3641 题意:由费马小定理可得,对于素数p,a^p = a (mod p),但是对于某些非素数p,也有比较小的可能满足a^p = a (mod p),如果满足,则称p是a条件下的伪素数,现给出p,a,问p是不是a条件的伪素数。 思路:首先用米勒 罗宾判断p是不是素数,如果不是,判断a^p = a (mod p)是否成立。 代码: ...
分类:其他好文   时间:2014-08-08 12:42:05    阅读次数:232
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