leetcode SN6 

 1 package leetcode;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 public class N3 {
 7     public static void main(String[] args) {
 8         String s = "abcdaaa";
 9         convert(s,2);
10     }
11     public static String convert(String s, int numRows) {
12         if(numRows < 2) {
13             return s;
14         }
15         List<StringBuilder> rows = new ArrayList<StringBuilder>();
16         for(int i = 0; i < numRows; i++) {
17             rows.add(new StringBuilder());
18         }
19         int i = 0, flag = -1;
20         for(char c : s.toCharArray()) {
21             rows.get(i).append(c);
22             if(i == 0 || i == numRows -1) {
23                 flag = -flag;
24             }
25             i += flag;
26         }
27         StringBuilder res = new StringBuilder();
28         for(StringBuilder row : rows) {
29             res.append(row);
30         }
31         return res.toString();
32     }
33 }

 

posted @ 2021-03-10 22:42  TRAODM  阅读(47)  评论(0)    收藏  举报