广州品牌网站建设公司可靠的网站优化

 题目说是z字形变化，但其实模拟更像n字形变化，找到字符下标规律就逐个拼接就能得到答案

 

class Solution {public String convert(String s, int numRows) {if(numRows==1)return s;StringBuilder stringBuilder = new StringBuilder();for (int i = 0; i < numRows; i++) {if (i != 0 && i != numRows - 1) {for (int j = i; j < s.length(); j += (numRows - 1) * 2) {stringBuilder.append(s.charAt(j));int index = j + (numRows - i - 1) * 2;if (index < s.length()) {stringBuilder.append(s.charAt(index));}}} else {for (int j = i; j < s.length(); j += (numRows - 1) * 2) {stringBuilder.append(s.charAt(j));}}}return stringBuilder.toString();}
}