Compilare: main.cpp: In function 'int BFS()': main.cpp:46:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad2[u].size(); ++i ) ~~^~~~~~~~~~~~~~~ main.cpp:60:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad2_rev[u].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Topo(int)': main.cpp:96:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void DFS(int, int)': main.cpp:112:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad_rev[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:142:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Ad[i].size(); ++j ) ~~^~~~~~~~~~~~~~