Compilare: user.cpp: In function ‘int cauta(std::__cxx11::string, std::__cxx11::string)’: user.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<a.length(); ++i) ^ user.cpp:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<b.length(); ++i) ^ user.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (z==a.length()) return 1; ^ user.cpp:32:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (z==a.length()) return 1; ^ user.cpp:14:11: warning: unused variable ‘ok’ [-Wunused-variable] int i,ok,j,z=0; ^ user.cpp:14:14: warning: unused variable ‘j’ [-Wunused-variable] int i,ok,j,z=0; ^ user.cpp: In function ‘int main()’: user.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[i].length() > maxim) || (v[i].length()==maxim && v[i]<v[sol])) ^ user.cpp:50:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[i].length() > maxim) || (v[i].length()==maxim && v[i]<v[sol])) ^ user.cpp:56:22: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << v[sol] << "\n"; ^