Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<G[x].size();it++) ~~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:32:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(!viz[i]) ^~ user.cpp:34:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ afisare(); ^~~~~~~