Compilare: user.cpp: In function ‘int main()’: user.cpp:29:34: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] dp[i&1][j]=max(dp[i&1][j],dp[i&1^1][j]); ^ user.cpp:32:41: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] dp[i&1][mask]=max(dp[i&1][mask],dp[i&1^1][j]+1); ^ user.cpp:17:12: warning: variable ‘best’ set but not used [-Wunused-but-set-variable] int n,i,j,best,mask,ans=0,x; ^