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Tested Python solution for LeetCode 171 with 20 pytest cases. Generate a practice environment with lcpy.
lcpy gen -n 171 # by problem number
lcpy gen -s excel_sheet_column_number # by problem name
columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.
For example:
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...
Input: columnTitle = "A"
Output: 1
Input: columnTitle = "AB"
Output: 28
Input: columnTitle = "ZY"
Output: 701
class Solution:
# Time: O(n)
# Space: O(1)
def title_to_number(self, column_title: str) -> int:
result = 0
for char in column_title:
result = result * 26 + (ord(char) - ord("A") + 1)
return result
| Time | Space |
|---|---|
| O(n) | O(1) |