38. Count and Say【E】【79】【leetcode】

原创于 2016-02-29 20:39:31 发布 · 360 阅读

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本文介绍了一种特殊的整数序列——计数并说序列，并提供了一个Python实现的例子。该序列从1开始，后续每一项都是对前一项的描述。例如，1被描述为“一个1”，即11；11被描述为“两个1”，即21。文章通过一个Python类的方法实现了生成指定位置的序列。

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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.

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就是简简单单按照这个过程复制一遍

class Solution(object):
    def countAndSay(self, n):
        res = '1'
        for i in xrange(n - 1):
            #print i,res

            cur = res[0]
            count = 1
            t_res = ''
            for j in res[1:]:
                if j == cur:
                    count += 1
                    continue
                else:
                    t_res += str(count) + cur
                    cur = j
                    count = 1
            t_res += str(count) + cur
            #print t_res,'\n'
            res = t_res

        return res