Compilare: user.cpp: In function ‘int main()’: user.cpp:48:16: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] if(((1<<j)&n-2)>0) { ^ user.cpp:38:14: warning: unused variable ‘a’ [-Wunused-variable] int t,x,y,z,a,b,c; ^ user.cpp:38:16: warning: unused variable ‘b’ [-Wunused-variable] int t,x,y,z,a,b,c; ^ user.cpp:38:18: warning: unused variable ‘c’ [-Wunused-variable] int t,x,y,z,a,b,c; ^