Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:30:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gf[node].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:88:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ans.size(); ++i) g << ans[i] << " "; ^ user.cpp:57:13: warning: unused variable ‘last’ [-Wunused-variable] int last = S; int lastCost = 0; ^ user.cpp:57:27: warning: unused variable ‘lastCost’ [-Wunused-variable] int last = S; int lastCost = 0; ^