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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".
public class Solution { public String convert(String s, int numRows) { char[] c = s.toCharArray(); int len = c.length; StringBuffer[] sb = new StringBuffer[numRows]; for(int i =0 ;i<numRows;i++) { sb[i]=new StringBuffer(); } int i = 0; while(i<len) { for(int idx=0;idx<numRows&&i<len;idx++) { sb[idx].append(c[i++]); } for(int idx=numRows-2;idx>=1&&i<len;idx--) { sb[idx].append(c[i++]); } } for (int idx = 1; idx < sb.length; idx++) sb[0].append(sb[idx]); return sb[0].toString(); } }
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原文地址：http://www.cnblogs.com/hygeia/p/5453689.html
