The count-and-say sequence is the sequence of integers beginning as
follows:1, 11, 21, 1211, 111221, ...
1 is read off as "one
1" or 11.11 is read off
as "two
1s" or 21.21 is read off
as "one 2, then one
1" or 1211.
Given an integer n, generate the nth sequence.
Note: The sequence of integers will be represented as a string.
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30 |
public class Solution { /**It is simple problem. * @author Averill Zheng * @version 2014-06-07 * @since JDK 1.7 */ public
String countAndSay(int
n) { String result = "1"; for(int
i = 1; i < n; ++i){ StringBuffer resultBuffer = new
StringBuffer(); int
length = result.length(); char
currentChar = result.charAt(0); int
count = 0; for(int
j = 0; j < length; ++j){ if(currentChar != result.charAt(j)){ resultBuffer.append(count); resultBuffer.append(currentChar - ‘0‘); currentChar = result.charAt(j); count = 1; } else ++count; } resultBuffer.append(count); resultBuffer.append(currentChar - ‘0‘); result = resultBuffer.toString(); } return
result; }} |
leetcode--Count and Say,布布扣,bubuko.com
原文：http://www.cnblogs.com/averillzheng/p/3779165.html