Compilare: main.cpp: In function 'void bfs()': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<l[x].size();j++) ~^~~~~~~~~~~~ main.cpp:16:35: warning: iteration 1005 invokes undefined behavior [-Waggressive-loop-optimizations] for (int i=0;i<=1005;i++) v[i]=0; ~~~~^~ main.cpp:16:19: note: within this loop for (int i=0;i<=1005;i++) v[i]=0; ~^~~~~~