Eroare de compilare: user.cpp: In member function ‘void BIT::Update(int, int, int)’: user.cpp:25:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = a; i <= _container.size() - 1; i+=idx(i)) ^ user.cpp:27:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = b; j <= _container[i].size() - 1; j += idx(j)) ^ In file included from /usr/include/c++/4.8/algorithm:62:0, from user.cpp:2: /usr/include/c++/4.8/bits/stl_algo.h: In instantiation of ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Box*, std::vector<Box> >; _Tp = Box]’: /usr/include/c++/4.8/bits/stl_algo.h:2307:70: required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Box*, std::vector<Box> >]’ /usr/include/c++/4.8/bits/stl_algo.h:2338:54: required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Box*, std::vector<Box> >; _Size = int]’ /usr/include/c++/4.8/bits/stl_algo.h:5475:36: required from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<Box*, std::vector<Box> >]’ user.cpp:85:34: required from here /usr/include/c++/4.8/bits/stl_algo.h:2269:19: error: passing ‘const Box’ as ‘this’ argument of ‘bool Box::operator<(const Box&)’ discards qualifiers [-fpermissive] while (__pivot < *__last) ^