算法协会的日子
从来没想过，我在算法协会发展成现在的样子。现在，应该和退出协会差不多了吧。
2018年7月中旬，我第一次了解到这个协会。
There are three rules to sort the structs.
This just struct sort. The most easy one with no tricks.
Using the math way of transforming the decimal to any number.
So our goal is to find whether there is a difference between two words that is not even.
Using stringstream can help make the problem easy. Using stringstream to traverse the sentence word by word.
The point of this problem is to input a string with spaces.