Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<l[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:83:33: warning: 'mxb' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<mx<<" "<<mxa<<" "<<mxb; ^ main.cpp:83:25: warning: 'mxa' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<mx<<" "<<mxa<<" "<<mxb; ^~~