"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"
.
转载自 点击打开链接
public class Solution { public String convert(String s, int numRows) { char[] ss =s.toCharArray(); if(numRows<=1){ return s; }else if(numRows>=s.length()){ return s; }else{ StringBuffer result=new StringBuffer(); int tap= 2*numRows-2; //先添加第一行的字符 for(int i=0;i<s.length();i+=tap){ result.append(ss[i]); } //然后添加中间行 int temp = tap -2; for(int i=1;i<numRows-1;i++){ for(int j=i;j<s.length();j+=tap) { result.append(ss[j]); if(j+temp<s.length()){ result.append(ss[j+temp]); } } temp-=2; } //添加最后一行 for(int i=numRows-1;i<s.length();i+=tap){ result.append(ss[i]); } return result.toString(); } } }