Compilare: user.cpp: In function ‘int main()’: user.cpp:15:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((ult=sir.find(subsir.c_str(),ult+1,n))!=string::npos) ^ user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<rez.size()&&i<1000;++i) ^