Compilare: user.cpp: In function ‘int main()’: user.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp:26:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+2<s.size()&&s[i]=='.'&&s[i+1]=='.'&&s[i+2]=='.') ^ user.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++)fout<<v[i]<<"\n"; ^