Compilare: user.cpp: In function 'void reset()': user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int BF()': user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void save()': user.cpp:75: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:117: warning: comparison between signed and unsigned integer expressions