Compilare: user.cpp: In function 'int main()': user.cpp:15: warning: unused variable 'z' user.cpp: In function 'void read()': user.cpp:42: warning: unused variable 'i' user.cpp:42: warning: unused variable 'j' user.cpp: In function 'int go(int)': user.cpp:60: warning: comparison between signed and unsigned integer expressions user.cpp:66: warning: comparison between signed and unsigned integer expressions user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp:77: warning: comparison between signed and unsigned integer expressions user.cpp:81: warning: comparison between signed and unsigned integer expressions