Design a compact data structure,TTI,which consists of three nested tiers of time intervals,for monitoring data entrance into the sliding window so as to identify the current abnormity at any time.

• 为保证可以随时输出当前的异常模式,引入一种简单且有效的数据结构??三层时间区间嵌套模式(TTI),来监测数据流。