Compilare: user.cpp: In function ‘int bfs1(int)’: user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[x].size(); i++) ^ user.cpp: In function ‘void bfs2(int)’: user.cpp:67:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[x].size(); i++) ^