LeetCode Problem6 ZigZag Conversion

The string

"PAYPALISHIRING"

is written in a zigzag pattern on a given number
of rows like this: (you may want to display this pattern in a fixed font for better legibility)

P   A   H   N
A P L S I I G
Y   I   R

And then read line by line:

"PAHNAPLSIIGYIR"

Write the code that will take a string and make this conversion given a number of rows:

string convert(string text, int nRows);

convert("PAYPALISHIRING", 3)

should
return

"PAHNAPLSIIGYIR"

.

思路:本题就是一个找规律的题目，没有什么意思。规律详见 http://blog.csdn.net/zhouworld16/article/details/14121477
没什么意思。