Compilare: main.cpp: In function 'int main()': main.cpp:103:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<lista.size()-1;i++) ~^~~~~~~~~~~~~~~ main.cpp:102:10: warning: unused variable 'ok' [-Wunused-variable] bool ok=0; ^~ main.cpp:120:51: warning: 'minus_v' may be used uninitialized in this function [-Wmaybe-uninitialized] edge.pb({reprez[plus_v],reprez[minus_v]}); ^