View Compilation Error

0_0_32329988_8835.cpp: In function 'int main()':
0_0_32329988_8835.cpp:21:12: error: 's' was not declared in this scope
     if(it!=s.end()){
            ^
0_0_32329988_8835.cpp:22:21: error: invalid type argument of unary '*' (have 'int')
      printf("%d\n",*it);
                     ^
0_0_32329988_8835.cpp:23:15: error: invalid type argument of unary '*' (have 'int')
      s.erase(*it);
               ^