Compilare: main.cpp: In function 'void Topo_sort(int)': main.cpp:48:21: 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:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[i].size(); ++j ) ~~^~~~~~~~~~~~~~ main.cpp:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[u].size(); ++j ) ~~^~~~~~~~~~~~~~ main.cpp:102:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[u].size(); ++j ) ~~^~~~~~~~~~~~~~