Compilare: main.cpp: In function 'void dfs(int)': main.cpp:117:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:189:9: warning: unused variable 'afis' [-Wunused-variable] int afis; ^~~~