Compilare: user.cpp: In function ‘int memo(int)’: user.cpp:13:29: warning: suggest parentheses around arithmetic in operand of ‘|’ [-Wparentheses] int ns=state^(1<<i)|(1<<lb); ^ user.cpp: In function ‘int main()’: user.cpp:29:18: warning: unused variable ‘x’ [-Wunused-variable] int si=0,x,cnt=0; ^