题目：
Excel表列名称：给定一个正整数，返回它在 Excel 表中相对应的列名称。
例如，
1 -> A
2 -> B
3 -> C
...
26 -> Z
27 -> AA
28 -> AB
...
思路：
利用字典来做，思路较简单。
程序：
class Solution:
def convertToTitle(self, n: int) -> str:
myDict = {1: 'A',
2: 'B',
3: 'C',
4: 'D',
5: 'E',
6: 'F',
7: 'G',
8: 'H',
9: 'I',
10: 'J',
11: 'K',
12: 'L',
13: 'M',
14: 'N',
15: 'O',
16: 'P',
17: 'Q',
18: 'R',
19: 'S',
20: 'T',
21: 'U',
22: 'V',
23: 'W',
24: 'X',
25: 'Y',
26: 'Z',
}
if n == 0:
return ""
result = ''
while n > 26:
auxiliary1 = n % 26
if auxiliary1 == 0:
result = result + myDict[26]
n = n // 26 - 1
else:
result = result + myDict[auxiliary1]
n = n // 26
result = result + myDict[n]
result = result[::-1]
return result