6. ZigZag Conversion

本文给出了Leetcode第6题的代码.

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”.

思路来自于： http://www.cnblogs.com/TenosDoIt/p/3738693.html

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public class Solution {
    public String convert(String s, int numRows) {
        if(numRows == 1)
            return s;
        int len = s.length(), k = 0, interval = (numRows<<1)-2;
        char[] res = new char[len];
        for(int j = 0; j < len ; j += interval)//处理第一行
            res[k++] = s.charAt(j);
        for(int i = 1; i < numRows-1; i++)//处理中间行
        {
            int inter = (i<<1);
            for(int j = i; j < len; j += inter)
            {
                res[k++] = s.charAt(j);
                inter = interval - inter;
            }
        }
        for(int j = numRows-1; j < len ; j += interval)//处理最后一行
            res[k++] = s.charAt(j);
        return new String(res);
    }
}
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