Compilare: user.cpp: In function ‘std::vector<std::vector<int> > s(int, int)’: user.cpp:35:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<b.size(); i++) b[i].push_back(n); ^ user.cpp: In function ‘int main()’: user.cpp:51:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) { ^ user.cpp:53:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<temp.size(); j++) g<<temp[j]<<" "; ^