View Compilation Error

0_0_33555704_6766.cpp: In function 'int main()':
0_0_33555704_6766.cpp:51:24: error: 'sort' was not declared in this scope
   }sort(rule+1,rule+n+1);newn=unique(rule+1,rule+n+1)-rule-1;
                        ^
0_0_33555704_6766.cpp:51:53: error: 'unique' was not declared in this scope
   }sort(rule+1,rule+n+1);newn=unique(rule+1,rule+n+1)-rule-1;
                                                     ^
0_0_33555704_6766.cpp:55:59: error: 'lower_bound' was not declared in this scope
    h[i]=++tot;int vi=lower_bound(rule+1,rule+newn+1,num[i])-rule;
                                                           ^