It is said that a dormitory with 6 persons has 7 chat groups ^_^. But the number can be even larger: since every 3 or more persons could make a chat group, there can be 42 different chat groups. Given N persons in a dormitory, and every K or more per…
题目传送:http://acm.hdu.edu.cn/showproblem.php?pid=4704 Problem Description Sample Input 2 Sample Output 2 Hint 1. For N = 2, S(1) = S(2) = 1. 2. The input file consists of multiple test cases. 题意是输入一个N,求N被分成1个数的结果+被分成2个数的结果+...+被分成N个数的结果,N很大 1.隔板原…
题目:求a^b*c%mod; 其中b<=10^100000; 是不是很大..... /*当你要计算 A^B%C的时候 因为此题中的B很大,达到10^100000,所以我们应该联想到降幂公式. 降幂公式:A^B%C = A^(B%phi(C) + phi(C))%C 分两种情况: 当B<=phi(C)时,直接用快速幂计算A^B mod C 当B>phi(C)时,用快速幂计算A^(B mod phi(C)+phi(C)) mod C */ #include <cstdio> #i…
2013长春赛区网络赛的1009题 比赛的时候这道题英勇的挂掉了,原因是写错了一个系数,有时候粗心比脑残更可怕 本题是关于Bell数,关于Bell数的详情请见维基:http://en.wikipedia.org/wiki/Bell_number 其中有一句话是这么说的: And they satisfy "Touchard's congruence": If p is any prime bumber then 但95041567不是素数, 分解之后发现 95041567 = 31 ×…
2^x mod n = 1 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9231 Accepted Submission(s): 2837 Problem Description Give a number n, find the minimum x(x>0) that satisfies 2^x mod n = 1. In…
2219: A^X mod P Time Limit: 5 Sec Memory Limit: 128 MB Submit: 417 Solved: 68 [Submit][Status][Web Board] Description It's easy for ACMer to calculate A^X mod P. Now given seven integers n, A, K, a, b, m, P, and a function f(x) which defined as fol…
A^B mod C Given A,B,C, You should quickly calculate the result of A^B mod C. (1<=A,B,C<2^63). Input There are multiply testcases. Each testcase, there is one line contains three integers A, B and C, separated by a single space. Output For each testc…
题目链接:http://acm.fzu.edu.cn/problem.php?pid=1759 题目:Problem Description Given A,B,C, You should quickly calculate the result of A^B mod C. (1<=A,C<=1000000000,1<=B<=10^1000000). Input There are multiply testcases. Each testcase, there is one li…
Number Sequence Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 187893 Accepted Submission(s): 46820 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A…
给出3个正整数A B C,求A^B Mod C. 例如,3 5 8,3^5 Mod 8 = 3. Input 3个正整数A B C,中间用空格分隔.(1 <= A,B,C <= 10^9) Output 输出计算结果 Input示例 3 5 8 Output示例 3解:思路一:暴力求解.思路二:通过公式(a * b) mod c = ((a mod c)*(b mod c)) mod c 简化求解.思路三:快速幂.简单的说,快速幂就是将指数转化为二进制的形式并差分开相乘(理解的关键在于明白…
下面我们来看一个容易让人蒙圈的问题:N的阶乘 mod P. 51Nod 1008 N的阶乘 mod P 看到这个可能有的人会想起快速幂,快速幂是N的M次方 mod P,这里可能你就要说你不会做了,其实你会,为什么呢,只要你明白快速幂的原理,你就会发现他们两个其实差不多是同一个问题. 重要原理:积的取模=取模的积再取模. 快速幂不过是一直乘的相同的的数,这里仅仅是改成乘以不同的数而已. 题目: 输入N和P(P为质数),求N! Mod P = ? (Mod 就是求模 %) 例如:n = 10, P…
// 快速幂,求a^b mod p int power(int a, int b, int p) { int ans = 1; for (; b; b >>= 1) { if (b & 1) ans = (long long)ans * a % p; a = (long long)a * a % p; } return ans; } // 64位整数乘法的O(log b)算法 long long mul(long long a, long long b, long long p) {…
题目链接 题意: 思路: 直接拿别人的图,自己写太麻烦了~ 然后就可以用矩阵快速幂套模板求递推式啦~ 另外: 这题想不到或者不会矩阵快速幂,根本没法做,还是2013年长沙邀请赛水题,也是2008年Google Codejam Round 1A的C题. #include <bits/stdc++.h> typedef long long ll; const int N = 5; int a, b, n, mod; /* *矩阵快速幂处理线性递推关系f(n)=a1f(n-1)+a2f(n-2)+.…
题目链接:51nod 1113 矩阵快速幂 模板题,学习下. #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> using namespace std; typedef long long ll; ; ; int n, m; struct Mat{//矩阵 ll mat[N][N]; }; Mat operator * (Mat a, Mat b){//一次矩阵乘法…
Description has only two SentencesTime Limit: 3000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 852 Accepted Submission(s): 259 Problem Descriptionan = X*an-1 + Y and Y mod (X-1) = 0.Your task is to calculate th…
Tr A hdu1575 就是一个快速幂的应用: 只要知道怎么求矩阵相乘!!(比赛就知道会超时,就是没想到快速幂!!!) #include<iostream> #include<stdio.h> #include<string.h> #include<algorithm> using namespace std; ][],b[][],c[][]; int n; int main() { int t,i,j,m,k,d; __int64 sum; scanf(…
