Compilare: user.cpp: In function ‘int main()’: user.cpp:53:13: warning: unused variable ‘l2’ [-Wunused-variable] int l2,c2; ^~ user.cpp:53:16: warning: unused variable ‘c2’ [-Wunused-variable] int l2,c2; ^~ user.cpp:17:40: warning: unused variable ‘y’ [-Wunused-variable] int n,l,c,i=0,j=0,cnt=0,x=1,prev=0,y=1,ii; ^ user.cpp:49:9: warning: variable ‘s’ set but not used [-Wunused-but-set-variable] int s=0; ^