Compilare: user.cpp: In function ‘int main()’: user.cpp:71:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=lgA; i<B.length(); ++i) ^ user.cpp:89:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); ++i) ^