Borderou de evaluare (job #72294)

Eroare de compilare: In file included from /usr/include/c++/4.6/algorithm:63:0, from user.cpp:7: /usr/include/c++/4.6/bits/stl_algo.h: In function ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&) [with _RandomAccessIterator = Point*, _Tp = Point]’: /usr/include/c++/4.6/bits/stl_algo.h:2253:70: instantiated from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = Point*]’ /usr/include/c++/4.6/bits/stl_algo.h:2284:54: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = Point*, _Size = int]’ /usr/include/c++/4.6/bits/stl_algo.h:5407:4: instantiated from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = Point*]’ user.cpp:99:27: instantiated from here /usr/include/c++/4.6/bits/stl_algo.h:2215:4: error: passing ‘const Point’ as ‘this’ argument of ‘bool Point::operator<(const Point&)’ discards qualifiers [-fpermissive] user.cpp: In function ‘int main()’: user.cpp:83:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:84:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:86:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:91:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]