Compilare: user.cpp: In function ‘void udpate(int, int)’: user.cpp:57: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rezolva()’: user.cpp:68: warning: comparison between signed and unsigned integer expressions user.cpp:69: warning: array subscript has type ‘char’ user.cpp:71: warning: array subscript has type ‘char’ user.cpp:74: warning: comparison between signed and unsigned integer expressions user.cpp:75: warning: array subscript has type ‘char’ user.cpp:85: warning: comparison between signed and unsigned integer expressions user.cpp:86: warning: array subscript has type ‘char’ user.cpp:88: warning: array subscript has type ‘char’ user.cpp:95: warning: comparison between signed and unsigned integer expressions