Compilare: main.cpp: In function 'void DFS(int)': main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void DFSR(int)': main.cpp:57:23: 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:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol.size(); ++i) fout << Sol[i] << ' '; ~~^~~~~~~~~~~~