/in/foo.cc: In function 'int main()':
/in/foo.cc:11:8: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(n<0&&(~(n-1)>>i&1)!=0||j>i)
        ^
/in/foo.cc:16:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  else if(n>=0&&(n>>i&1)!=0||a>i)
              ^