HDU1262-寻找素数对

 //#include<bits/stdc++.h>
 #include<map>
 #include<cstdio>
 #include<string>
 #include<cmath>
 #include<iostream>
 using namespace std;
 int zhishu(int x){
     if(x==||x==){
         return ;
     }
     else{
         int tmp = (int)sqrt(x);
         if(x%==){
             return ;
         }
         for(int i=;i<=tmp;i+=){
             if(x % i==)
                 return ;
         }
         return ;
     }
 }
 int main(){
     int M;
     while(scanf("%d",&M)!=EOF){
         for(int i=M/;i>=;--i){
             if(zhishu(i)== && zhishu(M-i)==){
                 printf("%d %d\n",i,M-i);
                 break;
             }
         }
     }

     return ;
 }