Compilare: main.cpp: In function 'void bfs()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dijk()': main.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~