Compilare: user.cpp: In function ‘int main()’: user.cpp:24:23: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] nr+=a[i]*(1<<k-i); ^ user.cpp:29:32: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] nr=(nr-a[i-k]*(1<<k-1))*2+a[i]; ^