Compilare: user.cpp: In function ‘void solve_cmlsc(const std::vector<unsigned int>&, const std::vector<unsigned int>&, std::vector<std::vector<unsigned char> >&, std::vector<std::vector<std::pair<unsigned char, unsigned char> > >&)’: user.cpp:8:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < a.size(); ++i) { ^ user.cpp:9:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < b.size(); ++j) { ^