Compilare: user.cpp: In function 'void read()': user.cpp:29: warning: array subscript has type 'char' user.cpp:30: warning: array subscript has type 'char' user.cpp: In function 'int update(int, int)': user.cpp:37: warning: no return statement in function returning non-void user.cpp: In function 'void solve()': user.cpp:49: warning: unused variable 'j' user.cpp: In function 'int main()': user.cpp:67: warning: unused variable 'i' user.cpp: In function 'int update(int, int)': user.cpp:37: warning: control reaches end of non-void function /tmp/ccRx6Zqv.o: In function `read()': user.cpp:(.text+0x10e): warning: the `gets' function is dangerous and should not be used.