Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) ~^~~~~~~~~~~~ user.cpp: In function ‘void Read()’: user.cpp:33:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;++i) ^~~ user.cpp:35:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ DFS(1); ^~~