Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < L[nod].size(); i++) ~~^~~~~~~~~~~~~~~ user.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < L[nod].size(); i++) ~~^~~~~~~~~~~~~~~ user.cpp:72:8: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] sf = nod; ~~~^~~~~