Borderou de evaluare (job #407292)

Eroare de compilare: In file included from /usr/include/c++/4.6/algorithm:63:0, from user.cpp:2: /usr/include/c++/4.6/bits/stl_algo.h: In function ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::bitset<21u>*, std::vector<std::bitset<21u> > >, _Tp = std::bitset<21u>, _Compare = main()::<lambda(const std::bitset<21u>&, std::bitset<21u>&)>]’: /usr/include/c++/4.6/bits/stl_algo.h:2265:78: instantiated from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::bitset<21u>*, std::vector<std::bitset<21u> > >, _Compare = main()::<lambda(const std::bitset<21u>&, std::bitset<21u>&)>]’ /usr/include/c++/4.6/bits/stl_algo.h:2306:62: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::bitset<21u>*, std::vector<std::bitset<21u> > >, _Size = int, _Compare = main()::<lambda(const std::bitset<21u>&, std::bitset<21u>&)>]’ /usr/include/c++/4.6/bits/stl_algo.h:5445:4: instantiated from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<std::bitset<21u>*, std::vector<std::bitset<21u> > >, _Compare = main()::<lambda(const std::bitset<21u>&, std::bitset<21u>&)>]’ user.cpp:37:4: instantiated from here /usr/include/c++/4.6/bits/stl_algo.h:2233:4: error: no match for call to ‘(main()::<lambda(const std::bitset<21u>&, std::bitset<21u>&)>) (std::bitset<21u>&, const std::bitset<21u>&)’ user.cpp:32:34: note: candidates are: /usr/include/c++/4.6/bits/stl_algo.h:2233:4: note: bool (*)(const std::bitset<21u>&, std::bitset<21u>&) <conversion> /usr/include/c++/4.6/bits/stl_algo.h:2233:4: note: candidate expects 3 arguments, 3 provided user.cpp:32:84: note: main()::<lambda(const std::bitset<21u>&, std::bitset<21u>&)> user.cpp:32:84: note: no known conversion for argument 2 from ‘const std::bitset<21u>’ to ‘std::bitset<21u>&’