Compilare: user.cpp: In function ‘int main()’: user.cpp:9:20: warning: variable ‘st’ set but not used [-Wunused-but-set-variable] int k,n,l,i,j,x,st,dr,sl; ^ user.cpp:9:23: warning: variable ‘dr’ set but not used [-Wunused-but-set-variable] int k,n,l,i,j,x,st,dr,sl; ^ user.cpp:9:26: warning: unused variable ‘sl’ [-Wunused-variable] int k,n,l,i,j,x,st,dr,sl; ^ /tmp/cciu996c.o: In function `main': user.cpp:(.text.startup+0x4e): warning: the `gets' function is dangerous and should not be used.