Compilare: user.cpp: In function ‘void calc(int, std::vector<int>, std::vector<int>)’: user.cpp:64:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size()&&i<l.size();i++) ^ user.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size()&&i<l.size();i++) ^ user.cpp:66:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<c.size();i++) ^ user.cpp:68:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<l.size();i++) ^