Compilare: main.cpp: In function 'void dfs(int)': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[node].size() ; i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:15: warning: unused variable 'node' [-Wunused-variable] int i,x,y,node,time; ^~~~ main.cpp:29:20: warning: unused variable 'time' [-Wunused-variable] int i,x,y,node,time; ^~~~