View Compilation Error

0_0_39572322_29350.cpp:8:1: error: 'set' does not name a type
    8 | set<ll> st;
      | ^~~
0_0_39572322_29350.cpp: In function 'int main()':
0_0_39572322_29350.cpp:12:9: error: 'st' was not declared in this scope; did you mean 'std'?
   12 |         st.insert(1);
      |         ^~
      |         std