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".
1 public class Solution { 2 public String convert(String s, int nRows) { 3 if(nRows<=1 || s.length()<=0) return s; 4 StringBuilder sb = new StringBuilder(); 5 for(int i=0;i<nRows;i++){ 6 for(int j=0,index=i;index<s.length();j++,index=(nRows+nRows-2)*j+i){ 7 sb.append(s.charAt(index));//add red char 8 if(i==0 ||i ==nRows-1)// first and last line don‘t have green char 9 continue; 10 if(index+(nRows-i-1)*2<s.length()){ 11 sb.append(s.charAt(index+(nRows-i-1)*2)); 12 } 13 } 14 } 15 return sb.toString(); 16 } 17 }
原文：http://www.cnblogs.com/krunning/p/3552026.html
