Compilare: main.cpp: In function 'void Dfs(int, int)': main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( V.size() != N * 2 - 1 ) { fout << "NU\n"; return; } ~~~~~~~~~^~~~~~~~~~~~ main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V.size() - 1; ++i ) ~~^~~~~~~~~~~~~~