CodingEasycod-g949

Subject StringsLevel Entry–Mid~14 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Run-length encode a string s: replace each maximal run of one repeated character with that character followed by the run length as a decimal number. For example 'aaabbc' becomes 'a3b2c1'. Every character, even a run of length 1, gets a count. The string contains only lowercase letters and may be empty (return '').

Implement

run_length_encode(s: str) → str

Examples

in["aaabbc"]out"a3b2c1"

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.