Compilare: main.cpp: In function 'bool dijkstra()': main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<lista[u].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:17:11: warning: unused variable 'j' [-Wunused-variable] int i,j,u,v,c; ^ main.cpp:42:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^