PTA A1031. Hello World for U（使用fgets注意换行符的读入）

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于 2019-04-28 11:13:30 发布 · 372 阅读

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#fgets #PTA

本博客主要解析PTA题目A1031的解决方案，涉及如何将任意字符串按照U形布局打印，并特别强调在使用fgets函数时注意换行符的处理。问题关键在于理解字符串布局规则，使U型形状尽量接近正方形，同时调整左右竖列字符数以适应限制条件。

题目描述如下：

1031 Hello World for U (20 point(s))

Given any string of N (≥5) characters, you are asked to form the characters into the shape of U. For example, helloworld can be printed as:

h  d
e  l
l  r
lowo

That is, the characters must be printed in the original order, starting top-down from the left vertical line with n1 characters, then left to right along the bottom line with n2 characters, and finally bottom-up along the vertical line with n3 characters. And more, we would like U to be as squared as possible -- that is, it must be satisfied that n1=n3=max { k | k≤n2 for all 3≤n2≤N } with n1+n2+n3−2=N.