高中 d010: 盈數、虧數和完全數

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#include <iostream>
using namespace std;

main() {
     int N ;
     while(cin >> N)
     {
         if(N>0)
         {
             int S = 0 , length = 0 , Factor[N] ;
             //取因數 
             for(int i = 1 ; i <= (N/2); i++ )
             {
                 if((N%i)==0)
                 {
                     Factor[length] = i ;
                     length++ ;
                 } 
             }
             //總和
             for(int i = 0 ; i < length ; i++ )
             {
                 S += Factor[i] ;
             }
             //印出
             if(S > N)
             {
                 cout << "盈數" << endl ;
             }
             else if(S==N)
             {
                 cout << "完全數" << endl ;
             }
             else
             {
                 cout << "虧數" << endl ;
             } 
         }
     }
}