View Compilation Error

0_0_36626849_3780.cpp: In function 'int main()':
0_0_36626849_3780.cpp:75:19: error: 'sort' was not declared in this scope
         sort(g,g+n);
                   ^
0_0_36626849_3780.cpp:76:22: error: 'unique' was not declared in this scope
   int pl=unique(g,g+n)-g;
                      ^