Strings · Coding problem

Excel Column Title

A free coding problem from the String Symbol Mapping skill. Read it here, then solve it in the app in Java or Python.

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  • Easy
  • Coding problem
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  • Java and Python

The problem

Spreadsheet columns are labeled A, B, ..., Z, AA, AB, ..., AZ, BA, ..., ZZ, AAA, ... Given a column number n (A is 1), return its title.

Example

Input:  53
Output: BA

Input:  1000
Output: ALL

Constraints

  • 1 <= n <= 2^31 - 1

How it's graded

  • Run checks your code against the examples. Submit also runs a hidden suite in four groups - basic cases, edge cases, random inputs and performance tests at the size limit - and shows which groups pass, never the hidden inputs.
  • Stuck? Hints come in four steps, from a nudge to a code skeleton, each costing part of the points.
  • Once you pass, you see the approaches from brute force to optimal, and where your solution lands among them.

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