Compilare: main.cpp: In function 'void Topo(int)': main.cpp:60:21: 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:90:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < S.size(); ++i ) ~~^~~~~~~~~~ main.cpp:98:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[u].size(); ++j ) ~~^~~~~~~~~~~~~~ main.cpp:84:16: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] Topo( start ); ^