Compilare: main.cpp: In function 'int BFS(int)': main.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Muchii[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void citire()': main.cpp:41:15: warning: iteration 40999 invokes undefined behavior [-Waggressive-loop-optimizations] lg[i] = lg[i / 2] + 1; ~~~~~~^~~~~~~~~~~~~~~ main.cpp:40:23: note: within this loop for (int i = 2; i <= 41001; ++i) ~~^~~~~~~~