本题求m的最大多少次幂是 n!的因子;也就是质因子分解 n!中某一质因子个数与m中质因子个数比的最小值。#include #include using namespace std;int sign[10010];int pri[10010];int tot;int e2[10010][1500],e...
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其他好文 时间:
2014-07-22 22:56:35
阅读次数:
239
题目简单的计算A,B之间有多少个素数只是测试数据有是负的//AC//A和B之间有多少个素数//数据可能有负的!!!#include#include//素数筛选法int pri[100000+10];//1 合数, 0 素数void Prime(){ memset(pri,0,sizeof(pr...
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其他好文 时间:
2014-07-19 20:04:10
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266
Summation of Four Primes
Input: standard input
Output: standard output
Time Limit: 4 seconds
Euler proved in one of his classic theorems that prime numbers are infinite in number. But can every nu...
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其他好文 时间:
2014-07-17 21:05:16
阅读次数:
299
??
Sum of Consecutive Prime Numbers
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 18782
Accepted: 10308
Description
Some positive integers can be represen...
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其他好文 时间:
2014-07-17 19:15:16
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260
UVA 11762 - Race to 1
题意:给定一个n,每次随即选择一个n以内的质数,如果不是质因子,就保持不变,如果是的话,就把n除掉该因子,问n变成1的次数的期望值
思路:tot为总的质数,cnt为质因子个数,那么f(n)=(1?cnt/tot)?f(n)+∑f(n/prime)?(1/tot),然后利用记忆化搜索去做即可
代码:
#include
#inclu...
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其他好文 时间:
2014-07-17 15:36:46
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211
Description
Current work in cryptography involves (among other things) large prime numbers and computing powers of numbers among these primes. Work in this area has resulted in the practical use of...
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其他好文 时间:
2014-07-17 10:12:16
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191
#include#include#include#include#include#include#include#include#include#include#includeusing namespace std;int n;int prime[100];void Prime(){ for(...
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其他好文 时间:
2014-07-16 00:58:49
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363
Time Limit:1000MS Memory Limit:10000KB 64bit IO Format:%I64d
& %I64u
Submit Status
Description
Ugly numbers are numbers whose only prime factors are 2, 3 or 5. The sequence
...
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其他好文 时间:
2014-07-14 14:03:02
阅读次数:
206
1.求1~100以内的素数prime=filter(lambda x: not [x%i for i in range(2,x) if x%i==0], range(2,101))#列表推导,一行搞定.print prime2.求字符串子串s='hauifnefldmfp'[s[i:i+n] for...
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编程语言 时间:
2014-07-13 23:39:55
阅读次数:
296
Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d
& %I64u
Submit Status
Description
If a and d are relatively prime positive integers, the arithmetic sequence begin...
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其他好文 时间:
2014-07-13 18:53:13
阅读次数:
251