Compilare: main.cpp: In function 'void dfs(int)': main.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:22:9: warning: unused variable 'a' [-Wunused-variable] int a=viz[nod]; ^ main.cpp: In function 'void afisare(int)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~