Compilare: user.cpp: In function ‘int main()’: user.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size();i++) ^ user.cpp:36:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=i;j<s.size();j++) ^ user.cpp:53:18: warning: ‘maxxx’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << maxxx; ^