Compilare: user.cpp: In function ‘int main()’: user.cpp:30:24: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for(int i=0;i<(1<<n-1);++i) ^ user.cpp:32:39: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] v[i].push_back((((i&(1<<(n-2))-1))<<1)); ^ user.cpp:33:39: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] v[i].push_back((((i&(1<<(n-2))-1))<<1)+1); ^