Borderou de evaluare (job #441945)

Eroare de compilare: In file included from /usr/include/c++/4.6/algorithm:63:0, from /usr/include/c++/4.6/i686-linux-gnu/./bits/stdc++.h:64, from user.cpp:1: /usr/include/c++/4.6/bits/stl_algo.h: In function ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&) [with _RandomAccessIterator = DC1*, _Tp = DC1]’: /usr/include/c++/4.6/bits/stl_algo.h:2253:70: instantiated from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = DC1*]’ /usr/include/c++/4.6/bits/stl_algo.h:2284:54: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = DC1*, _Size = int]’ /usr/include/c++/4.6/bits/stl_algo.h:5407:4: instantiated from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = DC1*]’ user.cpp:27:24: instantiated from here /usr/include/c++/4.6/bits/stl_algo.h:2215:4: error: passing ‘const DC1’ as ‘this’ argument of ‘bool DC1::operator<(const DC1&)’ discards qualifiers [-fpermissive] user.cpp: In function ‘int main()’: user.cpp:18:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:21:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:23:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]