You are given a stream of non-negative integers $a_1, a_2, \dots, a_n$. At any point, you need to summarize all numbers seen so far as a list of disjoint intervals.

Your task is to implement the Summary Ranges class, where:

• Constructor: Initializes the Summary Ranges object with an empty stream.

• Add Num(int value): Adds the integer value to the stream.

• Get Intervals(): Returns the current summary of numbers as a list of disjoint intervals [start_i, end_i], sorted by start_i.

Constraints:

• $0 \leq$ value $\leq 10^4$ ...