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POJ 3126 Prime Path( 广搜 )
Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 12974   Accepted: 7342 Description The ministers of the cabinet were quite upset by the message fr...
分类:其他好文   时间:2015-05-05 08:57:28    阅读次数:324
[leetcode] Count Primes
Count PrimesDescription:Count the number of prime numbers less than a non-negative number,nclick to show more hints.References:How Many Primes Are The...
分类:其他好文   时间:2015-05-04 21:41:10    阅读次数:112
数轮初步---无平方因子的数
这是从刘汝佳的算法竞赛入门经典中看到的题,书中是这么描述的 给出正整数n和m,输出在[m, n]中的无平方因子数。PS(无平方因子数的概念请自行百度) #include #include #include bool visited[10000005]; int prime[500000]; int main(){ int n, m; scanf("%d", &n, &m); int i,...
分类:其他好文   时间:2015-05-04 20:16:39    阅读次数:98
[LeetCode]Count Primes
Count the number of prime numbers less than a non-negative number, n 一个合数总是可以分解成若干质数的乘积。所以,如果把质数的倍数全都去掉,剩下的就是质数了。 要查找n以内的质数,首先2是质数,把2的倍数:4,6,8…去掉;此时3没有被去掉,可以认为是质数,再被3的倍数去掉;然后再到5,再到7,一直到sqrt(n)。设一个布尔类型...
分类:其他好文   时间:2015-05-04 20:15:50    阅读次数:121
poj3126 Prime Path
Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices.  — It i...
分类:其他好文   时间:2015-05-04 18:17:41    阅读次数:94
php获取某年某月的天数 【转】
function days_in_month($month, $year) { // calculate number of days in a month return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year...
分类:Web程序   时间:2015-05-04 15:16:43    阅读次数:195
ACMcoder[p1005]
题目:A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.Given A, B, and n, you are to calculate the ...
分类:其他好文   时间:2015-05-04 13:35:13    阅读次数:111
杭电 HDU ACM 1016 Prime Ring Problem
Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 31900    Accepted Submission(s): 14108 Problem Description A ring is...
分类:其他好文   时间:2015-05-04 10:06:07    阅读次数:163
求100以内的质数
求100以内的质数 By 白熊花田(http://blog.csdn.net/whiterbear) 转载需注明出处,谢谢。 描述: 输出100以内的所有素数,素数之间以一个空格区分 分析: 首先了解下素数:素数(prime number)又称质数,有无限个。一个大于1的自然数,除了1和它本身外,不能被整除以其他自然数(质数),换句话说就是该数...
分类:其他好文   时间:2015-05-03 23:46:14    阅读次数:319
CSU1602: Needle Throwing Game(投针问题)
Description There are many parallel lines on the ground with the distance of D between each adjacent two. Now, throwing a needle randomly on the ground,please calculate the possibility of that the ...
分类:Windows程序   时间:2015-05-03 20:41:42    阅读次数:232
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