View Compilation Error

0_0_29238834_18839.cpp: In function 'int main()':
0_0_29238834_18839.cpp:13:13: error: 'sort' was not declared in this scope
   sort(o,o+n);
             ^
0_0_29238834_18839.cpp:16:2: error: expected '}' at end of input
  }
  ^