Compilare: user.cpp: In function ‘bool query(f64, f64)’: user.cpp:77:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos + msk < bup.size() && bup[pos + msk].first < a) ^ user.cpp:83:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos + msk < bdn.size() && bdn[pos + msk].first < a) ^