View Compilation Error

0_0_30493539_19193.cpp: In function 'int main()':
0_0_30493539_19193.cpp:27:3: error: 'mulset' was not declared in this scope
   mulset <ll> s;
   ^
0_0_30493539_19193.cpp:5:12: error: expected primary-expression before 'long'
 #define ll long long
            ^
0_0_30493539_19193.cpp:27:11: note: in expansion of macro 'll'
   mulset <ll> s;
           ^
0_0_30493539_19193.cpp:31:4: error: 's' was not declared in this scope
    s.insert(a[i].y);
    ^
0_0_30493539_19193.cpp:39:4: error: 's' was not declared in this scope
    s.erase(s.find(a[i].y));
    ^