CodingEasycod-g1380

Subject StringsLevel Entry–Mid~10 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

A telemetry beacon sends status strings compressed as letter-count pairs: each lowercase letter is followed by a single digit from 1 to 9 saying how many times it repeats. Decode the transmission back to its expanded form. The input's length is always even and well-formed, and it may be empty. For example, 'a3b1' expands to 'aaab'.

Implement

rle_decode(encoded: str) → str

Examples

in["a3b1"]out"aaab"

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.

Learn the concepts

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.