View Compilation Error

0_0_22235401_10765.cpp: In function 'int main()':
0_0_22235401_10765.cpp:25:13: error: 'sort' was not declared in this scope
   sort(b,b+n);
             ^
0_0_22235401_10765.cpp:26:24: error: 'unique' was not declared in this scope
   int sz = unique(b,b+n)-b;
                        ^