Compilare: main.cpp: In function 'void dfs_pct(int, int)': main.cpp:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:27:16: warning: unused variable 'vf' [-Wunused-variable] int i,next,vf; ^~ main.cpp: In function 'void dfs(int, int)': main.cpp:58:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<v[nod].size(); k++) ~^~~~~~~~~~~~~~