Compilare: user.cpp: In function ‘bool safe(std::vector<sheap>&, int)’: user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos>=heap.size()) ^ user.cpp: In member function ‘bool dijkstra::add_or_update(sheap)’: user.cpp:146:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (upd.node>=vpos.size()) ^ user.cpp: In function ‘int main()’: user.cpp:244:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<orase.size();i++) ^ user.cpp:256:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i1=0;i1<muchii[now].size();i1++) ^ user.cpp:270:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i1=0;i1<orase.size();i1++) ^