Compilare: user.cpp: In function ‘bool egal(std::string, std::string)’: user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < x.size() ; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:109:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < comun.size() ; ++i) { ^ user.cpp:115:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < put.size() ; ++j) ^ user.cpp:120:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < put.size() ; ++j) ^ user.cpp:129:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < sol.size() ; ++i, fout << " ") ^