View Compilation Error

0_0_38005506_13128.cpp:4:12: error: '__int64_t' does not name a type
 #define ll __int64_t
            ^
0_0_38005506_13128.cpp:7:1: note: in expansion of macro 'll'
 ll n,m;
 ^
0_0_38005506_13128.cpp:4:12: error: '__int64_t' does not name a type
 #define ll __int64_t
            ^
0_0_38005506_13128.cpp:8:1: note: in expansion of macro 'll'
 ll f(ll x)
 ^
0_0_38005506_13128.cpp: In function 'int main()':
0_0_38005506_13128.cpp:21:14: error: 'n' was not declared in this scope
         cin>>n>>m;
              ^
0_0_38005506_13128.cpp:21:17: error: 'm' was not declared in this scope
         cin>>n>>m;
                 ^
0_0_38005506_13128.cpp:22:18: error: 'f' was not declared in this scope
         cout<<f(m)-f(n-1)<<"\n";
                  ^