Compilare: user.cpp: In function ‘void make_graph(int, int)’: user.cpp:80:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[a1].size(); i ++) ^ user.cpp:87:22: warning: the address of ‘ok’ will always evaluate as ‘true’ [-Waddress] if(ok) ^ user.cpp:79:22: warning: variable ‘verf’ set but not used [-Wunused-but-set-variable] bool verf = true; ^ user.cpp: In function ‘int dijkstra(std::pair<int, int>)’: user.cpp:124:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[st.second].size(); i ++) ^