The Expander

A easy Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

easy

Seniority

L4

Problem

Given an RLE-encoded string where each run is count followed by char (e.g. '3a2b1c'), return the decoded string. Counts are positive integers; characters are single letters.

Summary

What goes in small comes out big.

Practice This Problem

Solve this Python problem with real code execution. DataDriven runs your Python code in a real environment and grades it automatically.