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/*----------------------------------------------------------------
 @copyright
 content:a^3=b^3+c^3+d^3;
         1
    
   
    
     
         <=N;
         b<=c<=d;
 input:N(N<=100);
 output:Cube=a, Triple=(b,c,d); 
 if the result contains more than one 'a', 
 then first print the answer with smaller 'b', etc.
 author:szetrov
//----------------------------------------------------------------*)
/*----------------------------------------------------------------*
 *---------------------version 1.0----------------------------------
 #include 
     
      
 using namespace std;
 int main() {
     int a=0,b=0,c=0,d=0;
     int N=0;
     cin >> N;
     for(a=2; a<=N; a++) {
         for(d=2; d<=N; d++) {
             for(c=2; c<=d; c++) {
                 for(b=2; b<=c; b++) {
                     if((a*a*a) == ((b*b*b)+(c*c*c)+(d*d*d))
                         cout << "Cube=" << a << ", Triple=(" << b << "," << c << "," << d << ")";
                     }
                 }
             }
         }
     }
 }
 *----------------------------------------------------------------*
 
/*----------------------------------------------------------------*
 *---------------------version 2.0----------------------------------
 improvement:shorten the range and change inner loop order from a-d-c-b to a-b-c-d;
 #include 
      
       
 using namespace std;
 int main() {
     int a=0,b=0,c=0,d=0;
     int N=0;
     cin >> N;
     for(a=2; a<=N; a++) {
         for(b=2; b<=a-1; b++) {
             for(c=b; c<=a-1; c++) {
                 for(d=c; d<=a-1; d++) {
                     if((a*a*a) == ((b*b*b)+(c*c*c)+(d*d*d))
                         cout << "Cube=" << a << ", Triple=(" << b << "," << c << "," << d << ")";
                 }
             }
         }
     }
 }
 *----------------------------------------------------------------*
      
     
    
   
   

??????????????????????????1.0?????????????a?b?c?d??????????a? = b? + c? + d?????

??2.0????????????????????????a?b??c??d??????????????????????????????

???????????????????????????????????????????????????

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