Compilare: user.cpp: In function ‘int up()’: user.cpp:19:25: warning: no return statement in function returning non-void [-Wreturn-type] int up(){--y;u(1,0,n-1);} ^ user.cpp: In function ‘int qp()’: user.cpp:20:51: warning: no return statement in function returning non-void [-Wreturn-type] int qp(){M=-1;--y;--z;q(1,0,n-1);printf("%i\n",M);} ^ user.cpp: In function ‘int u(int, int, int)’: user.cpp:12:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int q(int, int, int)’: user.cpp:18:5: warning: control reaches end of non-void function [-Wreturn-type] } ^