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 nRows) {
int length = s.length();
if(nRows == 0)
return null;
if(length <= nRows || nRows == 1)
return s;
String[] zigzag = new String[nRows];
for(int i = 0; i < nRows; ++i)
zigzag[i] = "";
int startIndex = 0;
while(startIndex < length){
for(int j = 0 ; j < Math.min(length - startIndex, 2*nRows - 2); ++j){
if(j < nRows)
zigzag[j] += s.substring(startIndex + j, startIndex + j + 1);
else
zigzag[2*nRows - 2 - j] += s.substring(startIndex + j, startIndex + j + 1);
}
startIndex += 2*nRows - 2;
}
//concatenate components
String converted ="";
for(int i = 0; i < nRows; ++i)
converted += zigzag[i];
return converted;
}
}
leetcode--ZigZag Conversion,布布扣,bubuko.com
原文：http://www.cnblogs.com/averillzheng/p/3809185.html