Code Challenge #3

Spreadsheets often use this alphabetical encoding for its columns:

"A", "B", "C", ..., "AA", "AB", ..., "ZZ", "AAA", "AAB", .... Given a column number, return its alphabetical column id. For example, given 1, return "A". Given 27, return "AA".

Bonus Challenge Implement 3 stacks using a single list in Python.

Given this data structure:

class Stack: def __init__(self): self.list = [] def pop(self, stack_number): pass def push(self, item, stack_number): pass

Comment below with your solutions.