Given a positive integer, return its corresponding column title as appear in an Excel sheet.
For example:
1 -> A
2 -> B
3 -> C
...
26 -> Z
27 -> AA
28 -> AB
...
Example 1:
Input: 1
Output: "A"
Example 2:
Input: 28
Output: "AB"
Example 3:
Input: 701
Output: "ZY" ♡
class Solution(object):
def convertToTitle(self, n):
"""
:type n: int
:rtype: str
"""
s = ''
while n:
s = chr((n-1)%26 + 65) + s
n = int((n-1) / 26)
return s
Note: 并非从0开始,而是从1(A)开始,故需要-1.