Leetcode:excel Sheet Column Title

Title: Given A positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

Problem-Solving ideas: 10-in-turn 26-input system several points of note:

1.如何将数字转换成字符：使用指令chr(字符的ASCII码编号)。如chr(65)=‘A‘。2.如何将字符转换成数字：使用指令ord(‘字符‘)。如ord(‘A‘)=65。3.根据以上两条，可以令转换后的26进制字符： Title=chr[num%26+ord(‘A‘)]将26进制数字转换成字符。但是不能用 num%26 的方式，试想num=26，26%26=0。而ord(‘Z‘)=90，所以需要对num减1，即：Titel=chr[(num-1)%26+ord(‘A‘)]

Code:

class Solution(object):def convertToTitle(self, n):    """    :type n: int    :rtype: str    """    return(" " if n==0 else self.converToTitle((n-1)/26)+chr((n-1)%26+ord(‘A‘))    """    X if Y else Z的意思是：如果Y真返回X否则返回Z    self.convertToTitle：递归自己，即每一次使用(n-1)/26作为新n，进行chr((n-1)%26+ord(‘A‘))的计算    """

Code Listing 2:

class Solution(object):def convertToTitle(self, n):    """    :type n: int    :rtype: str    """    Title = ""    while(n>0):        n -=1        Title = chr(n%26+65)+Title        n /=26    

Leetcode:excel Sheet Column Title