View Compilation Error

0_0_29878141_23547.cpp: In function 'int main()':
0_0_29878141_23547.cpp:53:32: error: 'sort' was not declared in this scope
         sort(v.begin(), v.end()); 
                                ^
0_0_29878141_23547.cpp:54:42: error: 'unique' was not declared in this scope
         v.erase(unique(v.begin(), v.end()), v.end());
                                          ^