Compilare: main.cpp: In function 'bool Check(int, int)': main.cpp:61:21: 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:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[i].size(); ++j ) ~~^~~~~~~~~~~~~~ main.cpp:103:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad2[i].size(); ++j ) ~~^~~~~~~~~~~~~~~ main.cpp:111:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad2[first].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:122:20: warning: 'n_max' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << first << ' ' << n_max << '\n'; ^~~