算法提高 快速幂 时间限制:1.0s 内存限制:256.0MB 问题描述 给定A, B, P,求(A^B) mod P. 输入格式 输入共一行. 第一行有三个数,N, M, P. 输出格式 输出共一行,表示所求. 样例输入 2 5 3 样例输出 2 数据规模和约定 共10组数据 对100%的数据,A, B为long long范围内的非负整数,P为int内的非负整数. import java.util.Scanner; public class 快速幂 { static Scanner in =

快速幂形式 public static int f(int a,int b,int c){ int ans =1; int base=a; while(b!=0){ if((b&1)!=0) ans=(ans*base)%c; base=(base*base)%c; } return ans; } 快速乘法幂(优化) 幂转换成乘法,乘法转化成加法 public static int f(int a,int b,int c){ int ans = 0; int base=a; while(b!=0

快速幂取模算法的引入是从大数的小数取模的朴素算法的局限性所提出的,在朴素的方法中我们计算一个数比如5^1003%31是非常消耗我们的计算资源的,在整个计算过程中最麻烦的就是我们的5^1003这个过程 缺点1:在我们在之后计算指数的过程中,计算的数字不都拿得增大,非常的占用我们的计算资源(主要是时间,还有空间) 缺点2:我们计算的中间过程数字大的恐怖,我们现有的计算机是没有办法记录这么长的数据的,所以说我们必须要想一个更加高效的方法来解决这个问题 当我们计算AB%C的时候,最便捷的方法就是调用Ma

传送门 zhx's contest Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 575    Accepted Submission(s): 181 Problem Description As one of the most powerful brushes, zhx is required to give his juniors

#### 如题 (总结要点) 原文链接 : 1.主题 package blank; /** * 类的详细说明 给定一个double类型的浮点数base和int类型的整数exponent.求base的exponent次方. * 思路 : for循环 -->快速幂走一波 * 坑点: * 1. int类型的整数exponent ,可能为负值.0 ,没有规定是正整数 * // return Math.pow(base,exponent ); 快速搞定 */ public class Solution {

思路:快速幂裸题. //注意用long,否则会超范围 Problem Description 集训进行了将近2个礼拜,这段时间以恢复性训练为主,我一直在密切关注大家的训练情况,目前为止,对大家的表现相当满意,首先是绝大部分队员的训练积极性很高,其次,都很遵守集训纪律,最后,老队员也起到了很好的带头作用,这里特别感谢为这次DP专题练习赛提供题目和测试数据的集训队队长xhd同学. 特别高兴的是,跟随集训队训练的一批新队员表现非常好,进步也比较显著,特别是训练态度大大超出我的预期,我敢说,如果各位能如

1 什么是快速幂? 快速幂,顾名思义就是快速的求次幂,例如:a^b,普通的算法就是累乘,这样的计算方法的时间复杂度就是O(n),而快速幂的方法使得次幂的计算方法的时间复杂度降低到O(logn).  假设我们要求a^b的结果,这里我们可以将b转换为二进制来求.例如 a^ = a( ^ + ^ + ^ ) = a ^();

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

http://acm.hdu.edu.cn/showproblem.php?pid=4965 2014 Multi-University Training Contest 9 1006 Fast Matrix Calculation Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 238    Accepted Submission(

So Easy! Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2286    Accepted Submission(s): 710 Problem Description A sequence Sn is defined as:Where a, b, n, m are positive integers.┌x┐is the ceil

Recursive sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 30    Accepted Submission(s): 20 Problem Description Farmer John likes to play mathematics games with his N cows. Recently, the

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

2014多校第一题,当时几百个人交没人过,我也暴力交了几发,果然不行. 比完了去学习了BSGS才懂! 题目:http://acm.hdu.edu.cn/showproblem.php?pid=4887 Endless Punishment Time Limit: 30000/15000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 52    Accepted Submissi

zhx's contest Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 851    Accepted Submission(s): 282 Problem Description As one of the most powerful brushes, zhx is required to give his juniors n p

A Boring Question Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 156    Accepted Submission(s): 72 Problem Description       Input   The first line of the input contains the only integer T,(1≤T

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3175    Accepted Submission(s): 2373 Problem Description A为一个方阵,则Tr A表示A的迹(就是主对角线上各项的和),现要求Tr(A^k)%9973.   Input 数据的第一行是一个T,表示有T组数据.每组数据的第一行有n(2 <

Arc of Dream Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 4246    Accepted Submission(s): 1332 Problem Description An Arc of Dream is a curve defined by following function: wherea0 = A0ai = a

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) =

M斐波那契数列 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 3024    Accepted Submission(s): 930 Problem Description M斐波那契数列F[n]是一种整数数列,它的定义如下:F[0] = aF[1] = bF[n] = F[n-1] * F[n-2] ( n > 1 )现在给出a, b

A sequence of numbers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4550    Accepted Submission(s): 1444 Problem Description Xinlv wrote some sequences on the paper a long time ago, they might