Compilare: user.cpp: In function 'bool Match(int)': user.cpp:96: warning: comparison between signed and unsigned integer expressions user.cpp:109: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void TryMark(int)': user.cpp:142: warning: comparison between signed and unsigned integer expressions /tmp/cchpdhs3.o: In function `main': user.cpp:(.text+0x813): warning: the `gets' function is dangerous and should not be used.