View Compilation Error

0_0_38280453_4741.cpp: In function 'int main()':
0_0_38280453_4741.cpp:52:3: error: 'sort' is not a member of 'std'
   std::sort(&p[1],&p[n*2]+1);
   ^
0_0_38280453_4741.cpp:53:15: error: 'unique' is not a member of 'std'
   const int m=std::unique(&p[1],&p[n*2]+1)-p;
               ^