Compilare: user.cpp: In function ‘bool solv(std::string, std::string)’: user.cpp:13:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();++i){ ^ user.cpp:15:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz==b.size()) return 1; ^ user.cpp: In function ‘int main()’: user.cpp:27:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i].size()>mx) rez=v[i],mx=v[i].size(); ^ user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(v[i].size()==mx && v[i]<rez) rez=v[i]; ^