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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.
题意是n=1时输出字符串1;n=2时,数上次字符串中的数值个数,因为上次字符串有1个1,所以输出11;n=3时,由于上次字符是11,有2个1,所以输出21;n=4时,由于上次字符串是21,有1个2和1个1,所以输出1211。依次类推,写个countAndSay(n)函数返回字符串。
http://blog.csdn.net/kenden23/article/details/17081853
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原文地址:http://www.cnblogs.com/chess/p/5208634.html