Compilare: main.cpp: In function 'bool verif(int, int)': main.cpp:46:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int yy=0;yy<l[xx].size();yy++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:54:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<l[nod].size();i++) ~^~~~~~~~~~~~~~