给你两个数字p,a.如果p是素数,并且ap mod p = a,输出“yes”,否则输出“no”. 很简单的板子题.核心算法是幂取模(算法详见<算法竞赛入门经典>315页). 幂取模板子: int pow_mod(int a,int n,int m) { ) ; , m); long long ans = (long long)x * x % m; ) ans = ans * a % m; return (int)ans; } 题目代码也比较简单,有一个坑点是如果用筛素数打表,数组开不了这么大…
Pseudoprime numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 7954 Accepted: 3305 Description Fermat's theorem states that for any prime number p and for any integer a > 1, ap = a (mod p). That is, if we raise a to the pth power and…
Pseudoprime numbers Descriptions 费马定理指出,对于任意的素数 p 和任意的整数 a > 1,满足 ap = a (mod p) .也就是说,a的 p 次幂除以 p 的余数等于 a .p 的某些 (但不是很多) 非素数的值,被称之为以 a 为底的伪素数,对于某个 a 具有该特性.并且,某些 Carmichael 数,对于全部的 a 来说,是以 a为底的伪素数. 给定 2 < p ≤ 1000000000 且 1 < a < p ,判断 p 是否为以 …
Pseudoprime numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 11336 Accepted: 4891 Description Fermat's theorem states that for any prime number p and for any integer a > 1, ap = a (mod p). That is, if we raise a to the pth power…
题目连接 http://poj.org/problem?id=3641 Pseudoprime numbers Description Fermat's theorem states that for any prime number p and for any integer a > 1, ap = a (mod p). That is, if we raise a to the pth power and divide by p, the remainder is a. Some (but…
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1097 分析:简单题,快速幂取模, 由于只要求输出最后一位,所以开始就可以直接mod10. /*A hard puzzle Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 33036 Accepted Submission(s): 11821 Pr…
链接: http://acm.hdu.edu.cn/showproblem.php?pid=4506 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=29096#problem/B 小明系列故事——师兄帮帮忙 Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 3338 Ac…
Sumdiv Time Limit:1000MS Memory Limit:30000KB 64bit IO Format:%I64d & %I64u Submit Status Practice POJ 1845 Appoint description: System Crawler (2015-05-27) Description Consider two natural numbers A and B. Let S be the sum of all natural…
Pseudoprime numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 10903 Accepted: 4710 Description Fermat's theorem states that for any prime number p and for any integer a > 1, ap = a (mod p). That is, if we raise a to the pth power…
Matrix Power Series Time Limit: 3000MS Memory Limit: 131072K Total Submissions: 20309 Accepted: 8524 Description Given a n × n matrix A and a positive integer k, find the sum S = A + A2 + A3 + … + Ak. Input The input contains exactly one test cas…
https://codeforces.com/contest/1236/problem/B Alice got many presents these days. So she decided to pack them into boxes and send them to her friends. There are nn kinds of presents. Presents of one kind are identical (i.e. there is no way to disting…
小明系列故事——师兄帮帮忙 Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 3502 Accepted Submission(s): 894 Problem Description 小明自从告别了ACM/ICPC之后,就开始潜心研究数学问题了,一则可以为接下来的考研做准备,再者可以借此机会帮助一些同学,尤其是漂亮的师妹.这不,班里…
