注意：新手请千万不要先尝试这题，您可以看看通过率

I will give you series of pair of A and B, A and B are both integers. Test `long long` type in C/C++.
P.S.: 测试用的第 0 题，不会再添加中文描述。唯一的提醒是注意审题。

Several pairs of A and B, in C/C++, A and B are both in `long long` range.

The sum of A and B. Note that there is a blank line *between* two output lines.

1 1
5 3
10 20

2

8

30

注意审题哦~