Compilare: user.cpp: In function ‘void fuckit(int, i64)’: user.cpp:13:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] while(a-(1LL<<n-i)>0) { ^ user.cpp:14:19: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] a-=(1LL<<n-i); ^ user.cpp: In function ‘int main()’: user.cpp:23:9: warning: unused variable ‘s’ [-Wunused-variable] int s; ^