lc handbook

一会儿要去吃筑地，下午要去看啦
去之前赶紧刷一题

163. Missing Ranges

List list = new ArrayList();
        for(int n : nums){
            int justBelow = n - 1;
            if(lower == justBelow) list.add(lower+"");
            else if(lower < justBelow) list.add(lower + "->" + justBelow);
            lower = n+1;
        }
        if(lower == upper) list.add(lower+"");
        else if(lower < upper) list.add(lower + "->" + upper);
        return list;