(高精度） Round and Round We Go (1047)

這樣的題對于一次AC來說，，我是多少不容易。

#include<iostream>
#include<algorithm>

using namespace std;

//freopen("C://i.txt","r",stdin);

#define N 1000

int n;
char a[N];
char b[N];
int na[N];
int nb[N];
int c[N];

int main()
{
	freopen("C://i.txt","r",stdin);
	int i,j,k;
	while (cin>>a)
	{
		n=strlen(a);
		for (i=0;i<n;i++)
			b[i]=b[i+n]=a[i];

		for (i=0;i<n;i++)
			na[i]=a[i]-'0';
			
		for (i=0;i<2*n;i++)
			nb[i]=b[i]-'0';
		
		bool ans=true;
		for (k=2;k<=n;k++)
		{
			for (i=0;i<n;i++)
				c[i]=na[i]*k;
			bool ok=false;
			for (i=n-1;i;i--)
			{
				c[i-1]+=c[i]/10;
				c[i]%=10;
			}
			for (i=0;i<n;i++)
			{
				for (j=i;j<i+n;j++)
				{
					if (c[j-i]!=nb[j])
						break;
				}
				if (j==i+n)
				{
					ok=true;
					break;
				}
			}
			if (ok==false)
			{
				ans=false;
				break;
			}
		}
		printf("%s is ",a);
		if (!ans)
			printf("not ");
		printf("cyclic\n");
		
	}
}

           

Round and Round We Go

Time Limit: 1000MS	Memory Limit: 10000K
Total Submissions: 10463	Accepted: 4790

Description

A cyclic number is an integer n digits in length which, when multiplied by any integer from 1 to n, yields a"cycle"of the digits of the original number. That is, if you consider the number after the last digit to "wrap around"back to the first digit, the sequence of digits in both numbers will be the same, though they may start at different positions.For example, the number 142857 is cyclic, as illustrated by the following table:

142857 *1 = 142857

142857 *2 = 285714

142857 *3 = 428571

142857 *4 = 571428

142857 *5 = 714285

142857 *6 = 857142

Input

Write a program which will determine whether or not numbers are cyclic. The input file is a list of integers from 2 to 60 digits in length. (Note that preceding zeros should not be removed, they are considered part of the number and count in determining n. Thus, "01"is a two-digit number, distinct from "1" which is a one-digit number.)

Output

For each input integer, write a line in the output indicating whether or not it is cyclic.

Sample Input

142857
142856
142858
01
0588235294117647
      

Sample Output

142857 is cyclic
142856 is not cyclic
142858 is not cyclic
01 is not cyclic
0588235294117647 is cyclic