文章--LeetCode算法--TwoSumZigZagConversion
ZigZagConversion
问题描述
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"
实例
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".
代码实现
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 < sb.length; 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();
}
}