题目:
例如:
示例 1:
示例 2:
示例 3:
示例 4:
代码:
class Solution:
def convertToTitle(self, columnNumber: int) -> str:
num = columnNumber
s = ''
while num > 0:
num -= 1
a, b = num//26, num%26
s += chr(b+65)
num = a
return s[::-1]