hdu 5053 （2014上海网赛L题 求立方和）

题目大意：给你L到N的范围，要求你求这个范围内的所有整数的立方和。

Sample Input
2 //T
1 3
2 5

Sample Output
Case #1: 36
Case #2: 224

 # include <iostream>
 # include <cstdio>
 # include <cstring>
 # include <algorithm>
 # include <cmath>
 # define LL long long
 using namespace std ;

 int main ()
 {
     //freopen("in.txt","r",stdin) ;
     int T ;
     cin>>T ;
     int Case =  ;
     while(T--)
     {
         Case++ ;
         LL a , b ;
         cin>>a>>b ;
         LL i  , sum =  ;
         for (i = a ; i <= b ; i++)
             sum += i*i*i ;
         cout<<"Case #"<<Case<<": "<<sum<<endl ;
     }

     return  ;
 }