DigitalOcean Coding Interview Questions
25 DigitalOcean coding interview problems with full optimal solutions — 15 easy, 7 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an DigitalOcean interviewer values, and a FAQ section.
Showing 7 problems of 25
- #16mediumfoundational
16. Number of Islands
Count connected components in a grid using BFS/DFS — a staple at DigitalOcean that maps directly to cluster-discovery in network topology.
- #17mediumfoundational
17. LRU Cache
Design an LRU cache with O(1) get and put — a must-know data structure that DigitalOcean uses to probe OS-level caching intuition.
- #18mediumfoundational
18. Course Schedule
Detect a cycle in a directed dependency graph using topological sort — directly analogous to circular dependency detection in infrastructure automation.
- #19mediumfoundational
19. Implement Trie (Prefix Tree)
Build a prefix tree with insert, search, and startsWith operations — a data structure that powers hostname/IP prefix lookup in networking.
- #20mediumfoundational
20. Word Break
Determine if a string can be segmented using a dictionary — a DP problem that mirrors token parsing in config-automation pipelines.
- #21mediumfoundational
21. Find Minimum in Rotated Sorted Array
Find the minimum element in a rotated sorted array in O(log n) — a binary search variant that tests systematic halving under a shifted invariant.
- #22mediumfoundational
22. Clone Graph
Deep-copy an undirected graph using DFS and a visited map — directly models snapshotting a network topology for DR scenarios.