Compilare: user.cpp: In function ‘int main()’: user.cpp:18:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=omega.size()-pattern.size();i+=1) ^ user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<pattern.size()&&ok;j+=1) ^