Compilare: user.cpp: In function 'void build_graph()': user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void build(int)': user.cpp:55: warning: overflow in implicit constant conversion user.cpp:64: warning: overflow in implicit constant conversion user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int bf()': user.cpp:90: warning: comparison between signed and unsigned integer expressions