https://leetcode.com/problems/count-and-say/#/description
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.
Sol:
class Solution(object): def countAndSay(self, n): """ :type n: int :rtype: str """ s='1' for i in range(n-1): count = 1 temp = [] for index in range(1,len(s)): if s[index] == s[index-1]: count += 1 else: temp.append(str(count)) temp.append(s[index-1]) count = 1 temp.append(str(count)) temp.append(s[-1]) s = ''.join(temp) return s
TWO SOLUTIONS IN:
https://discuss.leetcode.com/topic/28084/simple-python-solution/4
.join() in python
http://www.cnblogs.com/jsplyy/p/5634640.html