Codeforces Round #199 (Div. 2) A Xenia and Divisors

注意题目的数字最大是7 而能整除的只有 1,2,3,4,6,故构成的组合只能是1,2,4 或1,2,6或1,3,6，故分别统计1,2,3,4,6的个数，然后再分配

 #include <iostream>
 #include <vector>
 #include <algorithm>
 #include <string>

 using namespace std;

 int main(){
     int n;
     cin >> n ;
     vector<int> a1,a2,a3,a4,a6;
     int tmp;
     for(int i =  ; i < n; i ++ ){
         cin >>tmp;
         if(tmp !=  && tmp != && tmp !=  && tmp !=  && tmp!=) { cout<<-<<endl; return ;}
         switch(tmp){
             case :
                 a1.push_back(tmp);
                 break;
             case :
                 a2.push_back(tmp);
                 break;
             case :
                 a3.push_back(tmp);
                 break;
             case :
                 a4.push_back(tmp);
                 break;
             case :
                 a6.push_back(tmp);
                 break;
         }
     }
     int len1 = a1.size(),len2 = a2.size(),len3 = a3.size(),len4 = a4.size(),len6 = a6.size();
     if( (len1=len1-len4)>= && (len2=len2 - len4 )>=  &&
         (len1= len1-len3)>= && (len6 = len6 - len3) >= &&
         (len1== len2 && len2 == len6)){
             for(int i = ; i < a4.size(); ++ i)
                 cout<<<<" "<<<<" "<<<<endl;
             for(int i = ; i < a3.size(); ++ i)
                 cout<<<<" "<<<<" "<<<<endl;
             for(int i = ; i < a6.size()-a3.size(); ++ i)
                 cout<<<<" "<<<<" "<<<<endl;
         }
     else{
         cout<<-<<endl;
     }

     return ;
 }