Compilare: main.cpp: In function 'void dijkstra()': main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void calc_nrdrm()': main.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:65:12: warning: variable 'val' set but not used [-Wunused-but-set-variable] double val,val2; ^~~