1 题目：
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 RAnd 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".
Stringpublic String convert(String s, int nRows) { char[] chars = s.toCharArray(); StringBuffer[] sbs = new StringBuffer[nRows+1]; for(int i = 0; i <= nRows ; i++){ sbs[i] = new StringBuffer(""); } int index = 0; int len = s.length(); while(index < len){ for(int i = 1; i <= nRows && index < len ; i++){ sbs[i].append(chars[index++]); // vertical down } for(int i = nRows - 2; i > 0 && index < len ; i--){ sbs[i+1].append(chars[index++]); //angle up } } for(int i = 1; i <= nRows; i++){ sbs[0].append(sbs[i]); } return sbs[0].toString(); }
原文：http://www.cnblogs.com/lingtingvfengsheng/p/4554978.html