Instacart Coding Interview Questions
28 Instacart coding interview problems with full optimal solutions — 16 easy, 10 medium, 2 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Instacart interviewer values, and a FAQ section.
Showing 2 problems of 28
- #24hardfoundational
24. Find Median from Data Stream
Maintain a running median as numbers stream in — Instacart applies this pattern to real-time delivery-time tracking where the median ETA must update on every new completed order without a full re-sort.
- #28hardfoundational
28. Minimum Window Substring
Find the shortest substring containing all required characters — Instacart uses the sliding-window pattern when scanning product descriptions for a mandatory set of nutritional keywords in the shortest possible text span.