算(7+4*sqrt(3))^n的整数部分(mod 1e9+7). 容易想到矩乘快速幂,但是怎么算整数部分呢? (7+4*sqrt(3))^n一定可以写成a+b*sqrt(3),同理(7-4*sqrt(3))^n一定可以写成a-b*sqrt(3),于是, (7+4*sqrt(3))^n = (7+4*sqrt(3))^n + (7-4*sqrt(3))^n - (7-4*sqrt(3))^n = 2*a - (7-4*sqrt(3))^n/*必然小于1*/ 所以其整数部分 = 2*a - 1 #…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2441    Accepted Submission(s): 1415 Problem Description Lele now is thinking about a simple function f(x). If x < 10 f(x) =…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1697    Accepted Submission(s): 959 Problem Description Lele now is thinking about a simple function f(x). If x < 10 f(x) =…

任意门:http://acm.hdu.edu.cn/showproblem.php?pid=1757 A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6621    Accepted Submission(s): 4071 Problem Description Lele now is thin…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4331    Accepted Submission(s): 2603 Problem Description Lele now is thinking about a simple function f(x).If x < 10 f(x) =…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 155 Accepted Submission(s): 110   Problem Description Lele now is thinking about a simple function f(x). If x < 10 f(x) = x.If…

题目 A Simple Math Problem 解析 矩阵快速幂模板题 构造矩阵 \[\begin{bmatrix}a_0&a_1&a_2&a_3&a_4&a_5&a_6&a_7&a_8&a_9\\ 1&0&0&0&0&0&0&0&0&0\\ 0&1&0&0&0&0&0&0&0&0\\ 0&…

A Simple Math Problem [题目链接]A Simple Math Problem [题目类型]矩阵快速幂 &题解: 这是一个模板题,也算是入门了吧. 推荐一个博客:点这里 跟着这个刷,应该就可以了 &代码: #include <cstdio> #include <iostream> #include <set> #include <cmath> #include <cstring> #include <al…

A Simple Math Problem 一个矩阵快速幂水题,关键在于如何构造矩阵.做过一些很裸的矩阵快速幂,比如斐波那契的变形,这个题就类似那种构造.比赛的时候手残把矩阵相乘的一个j写成了i,调试了好久才发现.改过来1A. 贴个AC的代码: const int N=1e5+10; ll k,m,s[10]; struct mat { ll a[10][10]; }; mat mat_mul(mat A,mat B) { mat res; memset(res.a,0,sizeof(res.a…

A Simple Math Problem Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2791    Accepted Submission(s): 1659 Problem Description Lele now is thinking about a simple function f(x). If x < 10 f(x) =…