1 #include <stdio.h> 2 3 int main(){ 4 __int64 number; 5 __int64 n; 6 __int64 result; 7 8 while(scanf("%I64d",&number)!=EOF){ 9 n=(number+1)/2; 10 11 result=n*(4*n*n-1)/3; 12 printf("%I64d\n",result); 13 14 } 15 return 0; 16 }
原文：http://www.cnblogs.com/zqxLonely/p/4088238.html