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".
Solution:
http://harrifeng.github.io/algo/leetcode/zigzag-conversion.html
1 public class Solution { 2 public String convert(String s, int nRows) { 3 if(nRows==1) 4 return s; 5 int zigSize=2*nRows-2; 6 StringBuilder[] sb=new StringBuilder[nRows]; 7 for(int i=0;i<nRows;++i){ 8 sb[i]=new StringBuilder(); 9 } 10 for(int i=0;i<s.length();++i){ 11 int newi=i%zigSize; 12 if(newi<nRows){ 13 sb[newi].append(s.charAt(i)); 14 }else{ 15 sb[zigSize-newi].append(s.charAt(i)); 16 } 17 } 18 StringBuilder result=new StringBuilder(); 19 for(StringBuilder i:sb){ 20 result.append(i); 21 } 22 return result.toString(); 23 } 24 }
原文：http://www.cnblogs.com/Phoebe815/p/4103495.html