找规律：（0，0），（0，1）......（6，6）；每次a和b的值是一样的。找规律，每49一次循环。
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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 cases. Each test case contains 3 integers A, B and n on a single line (1 <= A, B <= 1000, 1 <= n <= 100,000,000). Three zeros signal the end of input and this test case is not to be processed.
Output
For each test case, print the value of f(n) on a single line.
Sample Input
Sample Output
2
5
AC代码：
#include <iostream>
#include <cstdio>
using namespace std;
int main(void)
{
freopen("in.txt","r",stdin);
int a,b;
long long n;
while(scanf("%d%d%lld",&a,&b,&n)!=EOF&&(a||b||n))
{
int x[100];
x[1]=1;
x[2]=1;
for(int i=3;i<=49;i++)
x[i]=((a*x[i-1])%7 + (b*x[i-2])%7)%7;
printf("%d\n",x[n%49]);
}
fclose(stdin);
return 0;
}
HDOJ_1005_Number Sequence
原文：https://www.cnblogs.com/phaLQ/p/10030083.html
