View Compilation Error

0_0_37601101_17552.cpp: In function 'int main()':
0_0_37601101_17552.cpp:11:21: error: 'long long' invalid for 'type name'
 #define double long double
                     ^
0_0_37601101_17552.cpp:87:26: note: in expansion of macro 'double'
         double ans=(long double)1e9;
                          ^