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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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