贴个题目,然后。。。。最近常常卡题。。。。。
可以先不debug吗。。。
Problem description
When Grace was in third grade, her elementary school teacher assigned her the following problem:
What is the smallest possible sum of two numbers that together use the numerals 1, 2, 7, 8, and 9?
Grace figured out that the answer to this problem is 207 (for example, as 78 + 129), but when the teacher assigned four pages of similar problems as homework, Grace got bored. It turns out that Grace was......
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