2^x mod n = 1 Time Limit: 2 Seconds Memory Limit:65536 KB Give a number n, find the minimum x that satisfies 2^x mod n = 1. Input One positive integer on each line, the value of n. Output If the minimum x exists, print a line with 2^x mod n = 1.…
对于数论的学习比较的碎片化,所以开了一篇随笔来记录一下学习中遇到的一些坑,主要通过题目来讲解 本题围绕:积与余数 HDU1395 2^x mod n = 1 题目描述 输入一个数n,如果存在2的x次方mod输出的n余数为1,则输出2^x mod n = 1,否则输出2^? mod n = 1,其中n替换为每次输出的n的具体数值 输入 正整数n,读取到文件尾 输出 2^x mod n = 1或者2^? mod n = 1 样例输入 25 样例输出 2^? mod 2 = 1 2^4 mod 5 =…
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=489 题目大意: 给你正整数n,求最小的x使得2^x mod n = 1. 思路: n=1无解.任何正数mod 1都为0吧 n为偶数无解,why? 上式可变形为: 2^x=k*n+1,若n为偶数那么k*n+1为奇数,而2^x必为偶数. n为奇数一定有解,对于乘法逆元:在a mod n的操作下,a存在乘法逆元当且仅当a与n互质. #include<cstdio> int mai…
http://acm.hdu.edu.cn/showproblem.php?pid=1395 怎样取余是关键.. 2^x mod n = 1 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 9534 Accepted Submission(s): 2932 Problem Description Give a number n,…
2^x mod n = 1 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 20133 Accepted Submission(s): 6321 Problem Description Give a number n, find the minimum x(x>0) that satisfies 2^x mod n = 1. I…
主题链接: PKU:http://poj.org/problem?id=3652 ZJU:http://acm.zju.edu.cn/onlinejudge/showProblem.do? problemId=1933 HDU:http://acm.hdu.edu.cn/showproblem.php?pid=2721 Description WhatNext Software creates sequence generators that they hope will produce fai…
