一会儿要去吃筑地，下午要去看💍啦
去之前赶紧刷一题
- Missing Ranges
List<String> list = new ArrayList<String>();
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;
