View Compilation Error

0_0_32380858_19851.cpp:7:7: error: expected ';' at end of member declaration
  bool opeator < (const program& A) const{
       ^
0_0_32380858_19851.cpp:7:15: error: expected unqualified-id before '<' token
  bool opeator < (const program& A) const{
               ^
0_0_32380858_19851.cpp: In function 'int main(int, char**)':
0_0_32380858_19851.cpp:22:17: error: 'sort' was not declared in this scope
   sort(buf,buf+n);
                 ^
0_0_32380858_19851.cpp:22:17: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_32380858_19851.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note:   'std::sort'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^
0_0_32380858_19851.cpp:32:20: error: 'pritnf' was not declared in this scope
   pritnf("%d\n",ans);
                    ^