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”.
[code]
public class Solution {
public String convert(String s, int nRows) {
StringBuffer sb=new StringBuffer();
int i=0;
while(i<s.length())
{
for(int j=0;j<nRows;j++)
{
if(i>s.length()-1)break;
sb.append(s.charAt(i++));
}
int offset=nRows-3;
for(int j=0;j<nRows-2;j++)
{
int k;
for(k=0;k<=offset;k++)sb.append('@');
if(i>s.length()-1)break;
sb.append(s.charAt(i++));
for(;k<nRows-1;k++)sb.append('@');
offset--;
}
}
StringBuffer r=new StringBuffer();
for(i=0;i<nRows;i++)
{
int j=i;
while(j<sb.length())
{
if(sb.charAt(j)!='@')r.append(sb.charAt(j));
j+=nRows;
}
}
return r.toString();
}
}