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MediumPrep Room Coding #1202

Excel column title

CodingAlgorithms & data structuresMid–Senior~18 min

Convert a positive integer column number to its Excel/spreadsheet column title (1 -> 'A', 26 -> 'Z', 27 -> 'AA', 28 -> 'AB', 702 -> 'ZZ', 703 -> 'AAA'). This is bijective base-26 (there is no zero digit). Constraints: 1 <= n <= 2^31 - 1. Return the title string.

Implement
excel_column_title(n: int) → str
Examples
in[28]out"AB"
What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

0:00 of about 18 min
InputExpectedGot
[28]"AB"not run yetsample