View Compilation Error

0_0_29044835_6103.cpp: In function 'int main()':
0_0_29044835_6103.cpp:4:13: error: '_int64' was not declared in this scope
 #define  ll _int64
             ^
0_0_29044835_6103.cpp:8:5: note: in expansion of macro 'll'
     ll n;
     ^
0_0_29044835_6103.cpp:9:12: error: 'n' was not declared in this scope
     cin >> n;
            ^
0_0_29044835_6103.cpp:10:9: error: expected ';' before 'Ia'
      ll Ia,Ib;
         ^
0_0_29044835_6103.cpp:14:16: error: 'Ia' was not declared in this scope
         cin >> Ia >> Ib;
                ^
0_0_29044835_6103.cpp:14:22: error: 'Ib' was not declared in this scope
         cin >> Ia >> Ib;
                      ^