Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[vf].size(); i++) ~^~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[vf].size(); i++) ~^~~~~~~~~~~~~