Compilare: user.cpp: In function ‘void go()’: user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (lg==S.size()) ++nr; ^ user.cpp: In function ‘int main()’: user.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (S.size()>maxlg) maxlg=S.size(), cntlg=0; ^ user.cpp:42:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (S.size()==maxlg) ++cntlg; ^ user.cpp:53:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (S.size()>maxlg) g<<0<<'\n'; ^ user.cpp:54:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (S.size()==maxlg) g<<cntlg<<'\n'; ^