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   NA P L S I I GY   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：找出规律，然后按照新字符串的顺序放到新字符串中，注意下标。

class Solution {        public String convert(String s, int numRows) {        if(numRows<=1||numRows>=s.length())return s;               StringBuffer newString=new StringBuffer();        int gap=2*numRows-2;//周期数        int n=numRows;//循环数        int index;                while(n-->0){            if(n==numRows-1||n==0){                for(int i=numRows-n-1;i