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   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".

public class Solution {    public String convert(String s, int numRows) {        if(numRows==1)        return s;        char[][] chs = new char[numRows][s.length()];int row = 0, col = 0, status = 0;StringBuilder sb = new StringBuilder();for (int i = 0; i < s.length(); i++) {status = col % (numRows - 1);if (status == 0) {for (row = 0; row < numRows && i < s.length(); row++,i++){chs[row][col] = s.charAt(i);}i--;col++;} else {chs[numRows - status - 1][col] = s.charAt(i);col++;}}for(int i=0;i<numRows;i++)for(int j=0;j<s.length();j++)if(chs[i][j]!='\0')sb.append(chs[i][j]);return sb.toString();    }}