A study partner who listens while you code — and talks back.
You know how to solve it. You fall apart explaining it.
Practice explaining your code out loud. Coco listens, asks what a line does, and draws on the page beside it — she never hands you the fix.
Try Two Sum free
Coco is in private pilot. The editor and Run are open to everyone.
two_sum.pySample
from typing import Listdef find_target_pair(nums: List[int], target: int) -> List[int]:seen = {}for i, num in enumerate(nums):seen[num] = iseen = {3: 0}need = target - numif need in seen:return [seen[need], i]return []
Coco: Hi, I’m Coco. What comes back for [3, 3], 6? Tell me or type it below, then press Run.
Run
Do the first rep before you decide. Hear one thing worth tightening.
Start with Two Sum. Write it, run it, and explain it out loud.