hdoj-1005-Number Sequences

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HDOJ(1005) Number Sequence

这道题,咋一看很像Fibonacci数列,使用递归或者改进的动态规划来解决.但是仔细一看,(1 <= n <= 100,000,000),使用这些方法,要么超时,要么肯定内存不够用,因此必须想别的办法.遇到这种情况也就只有找规律了.仔细看:f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7,因为存在取模运算,那么当n取到一定值后,f(n)肯定会重复出现.关于找规律的过程,博客园有一位朋友已经进行了详细分析了,请点击链接.下面给出最终的代码: #include&…

HDU 1005 Number Sequence（数列）

HDU 1005 Number Sequence(数列) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) [Description] [题目描述] A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, an…

1005 Number Sequence（HDU）

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1005 Number Sequence Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 85249 Accepted Submission(s): 20209 Problem Description A number sequence…

HDU 1005 Number Sequence(数论)

HDU 1005 Number Sequence(数论) Problem Description: A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n). Input The input consists of multipl…

Rabin_Karp(hash) HDOJ 1711 Number Sequence

题目传送门 /* Rabin_Karp:虽说用KMP更好,但是RK算法好理解.简单说一下RK算法的原理:首先把模式串的哈希值算出来, 在文本串里不断更新模式串的长度的哈希值,若相等,则找到了,否则整个模式串的长度的哈希值向右移动一位 */ /************************************************ * Author :Running_Time * Created Time :2015-8-5 14:04:26 * File Name :HDOJ_1711.…

HDU - 1005 Number Sequence 矩阵快速幂

HDU - 1005 Number Sequence Problem Description A number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.Given A, B, and n, you are to calculate the value of f(n). Input The input consists of multiple test…