poj 3006 java

   心粗糙了，将题目中“a and d are relatively prime”当成a和b都是素数，唉，其实说的是两者之间互质。英文差真无语。还有，判断素数时，1和2这两个真的要注意，细节决定成败啊。

 

import java.io.BufferedInputStream;
import java.util.Scanner;

public class Main {
    
    public static void main(String args[]){
        
        Scanner cin = new Scanner(new BufferedInputStream(System.in));
        int a,d,n,t=0;
        
        while(hasNext((a=cin.nextInt()),(d=cin.nextInt()),(n=cin.nextInt()))){
            
            if(Noregular(a, d, n)){
                System.out.println("The input is wrong!");
                continue;
            }
            
            int i=0;
            t=0;
            
            while(t<n){            
                if(Isprime(a+i*d)){
                    
                    t++;
                    i++;
                    
                }else{
                    i++;
                    
                }
                
            }
            
            i--;
            System.out.println((a+i*d));
            
            
            
        }
        
        
    }
    
    private static boolean Noregular(int a,int d,int n){
        
        if(a<=9307&&d<=346&&n<=210)
                return false;

        return true;
        
        
    }
    
    private static boolean hasNext(int a,int d,int n){
        
        if(a+d+n==0)
            return false;
        
        
        return true;
        
        
    }

    
    private static boolean Isprime(int num){
        
        if(num==1)
            return false;
        
        if(num==2)
            return true;
        
        if(num%2==0)
            return false;
        
        for(int i=3;i<=Math.sqrt(num);i=i+2){
            if(num%i==0)
                return false;
        }
        

        
        return true;
    }

}