杭电 ACM 1014

不学好英文还真不行啊！！……  

Problem
Description
Computer simulations often require
random numbers. One way to generate pseudo-random numbers is via a
function of the form

seed(x+1) = [seed(x) + STEP] % MOD

where '%' is the modulus operator.

Such a function will generate pseudo-random numbers (seed) between
0 and MOD-1. One problem with functions of this form is that they
will always generate the same pattern over and over. In order to
minimize this effect, selecting the STEP and MOD values carefully
can result in a uniform distribution of all values between (and
including) 0 and MOD-1.

For example, if STEP = 3 and MOD = 5, the function will generate
the series of pseudo-random numbers 0, 3, 1, 4, 2 in a repeating
cycle. In this example, all of the numbers between and including 0
and MOD-1 will be generated every MOD iterations of the function.
Note that by the nature of the function to generate the same
seed(x+1) every time seed(x) occurs means that if a function will
generate all the numbers between 0 and MOD-1, it will generate
pseudo-random numbers uniformly with every MOD iterations.

If STEP = 15 and MOD = 20, the function generates the series 0, 15,
10, 5 (or any other repeating series if the initial seed is other
than 0). This is a poor selection of STEP and MOD because no
initial seed will generate all of the numbers from 0 and
MOD-1.

Your program will determine if choices of STEP and MOD will
generate a uniform distribution of pseudo-random numbers.
Input
Each line of input will contain a pair
of integers for STEP and MOD in that order (1 <=
STEP, MOD <= 100000).

Output
For each line of input, your program
should print the STEP value right- justified in columns 1 through
10, the MOD value right-justified in columns 11 through 20 and
either "Good Choice" or "Bad Choice" left-justified starting in
column 25. The "Good Choice" message should be printed when the
selection of STEP and MOD will generate all the numbers between and
including 0 and MOD-1 when MOD numbers are generated. Otherwise,
your program should print the message "Bad Choice". After each
output test set, your program should print exactly one blank
line.
Sample
Input
3 5

15 20

63923 99999
Sample
Output

        
3        
5    Good
Choice

       
15       
20    Bad
Choice

    
63923    
99999    Good
Choice

////////////////////////////////////////////////////////////// 
# include<stdio.h>

int main()

{

 int m,n,t,m1,n1;

 while(scanf("%d%d",&m,&n)!=EOF)

 {

  m1=m;

  n1=n;

  if(n>m)

  {

   t=m;

   m=n;n=t;

  }

  while(n)

  {

   t=m%n;

   m=n;n=t;

  }

  if(m==1)

   printf("dd   
Good Choice\n\n",m1,n1);

  else

   printf("dd   
Bad Choice\n\n",m1,n1);

 }

 return 0;

}

//printf("dd+4个空格+Bad Choice\n\n",m1,n1);