/in/foo.cc: In function 'int main()':
/in/foo.cc:12:12: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
  if(j+(1<<i-1)<=n) f[j][i]=max_(f[j][i-1],f[j+(1<<i-1)][i-1]);
           ~^~
/in/foo.cc:12:52: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
  if(j+(1<<i-1)<=n) f[j][i]=max_(f[j][i-1],f[j+(1<<i-1)][i-1]);
                                                   ~^~