View Compilation Error

0_0_30545469_31490.cpp: In function 'void init_hash(int)':
0_0_30545469_31490.cpp:96:19: error: 'sort' was not declared in this scope
     sort(te,te+1+n);
                   ^
0_0_30545469_31490.cpp:97:27: error: 'unique' was not declared in this scope
     m = unique(te+1,te+1+n)-te-1;
                           ^