Compilare: user.cpp: In function ‘std::string max_lexic(std::string)’: user.cpp:45:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(2); i < s.size() - 1; i++) { ^ user.cpp:62:11: warning: statement has no effect [-Wunused-value] for (p; p < s.size() - 1; p++) ^ user.cpp:62:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (p; p < s.size() - 1; p++) ^ user.cpp: In function ‘int main()’: user.cpp:87:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(1); i < rez.size(); i++) ^