View Compilation Error

0_0_38268953_8287.cpp: In function 'int main()':
0_0_38268953_8287.cpp:37:27: error: 'sort' was not declared in this scope
   sort(st.begin(),st.end());
                           ^
0_0_38268953_8287.cpp:38:39: error: 'unique' was not declared in this scope
   st.resize(unique(st.begin(),st.end())-st.begin());
                                       ^