LeetCode#6 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”.

第一次看到这个题目的人，可能不知道ZigZag是什么意思，简单解释一下，就是把字符串原顺序012345……按下图所示排列：

这道题找规律即可，循环周期可能比较容易找，周期中间的规律 2 * nRows - 2 - 2 * i 可能不大好找。

public class Solution {  public String convert(String s, int nRows) {  int len = s.length();  if (len == 0 || nRows < 2) return s;  String ret = "";  int lag = 2*nRows - 2; //循环周期  for (int i = 0; i < nRows; i++) {  for (int j = i; j < len; j += lag) {  ret += s.charAt(j);  //非首行和末行时还要加一个  if (i > 0 && i < nRows-1) {  int t = j + lag - 2*i;  if (t < len) {  ret += s.charAt(t);  }  }  }  }  return ret;  }
}

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