Get Min Servers
Reported by candidates from Cisco's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Cisco sent you a problem called Get Min Servers, reported in September 2024. You're looking at a resource allocation or optimization question, likely asking you to find the minimum number of servers needed to handle a load or request scenario. The pattern here is greedy or math-based, not a standard data structure grind. StealthCoder can read the full problem during your OA and surface the constraint that breaks most attempts.
Pattern and pitfall
This is a classic binary search plus simulation pattern, or a greedy counting problem. The trick is that you can't just divide total load by server capacity. You need to check if a given number of servers can handle the request timeline, which means you simulate serving requests in order and track which server is free next. Binary search on the answer (number of servers from 1 to max needed), then for each candidate count, simulate and check if all requests can be served within their time windows. The common mistake is ignoring the constraint that servers must be available at the exact request time, not just eventually. StealthCoder will flag whether you need binary search or if a single pass greedy approach works.
The honest play: practice the pattern, and have StealthCoder ready for the one you didn't see coming.
You can drill Get Min Servers cold, or you can hedge it. StealthCoder runs invisibly during screen share and surfaces a working solution in under 2 seconds. The proctor sees the IDE. They don't see what's behind it. Built for the candidate who saw this exact problem leak two days before his OA and wondered if anyone had a play.
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Cisco reuses patterns across OAs. Built for the candidate who saw this exact problem leak two days before his OA and wondered if anyone had a play. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Get Min Servers FAQ
Is this really a greedy problem or do I need binary search?+
If the problem asks for the minimum servers and doesn't specify time windows strictly, it might be greedy. If requests have deadlines or service times overlap, you need binary search on the answer plus a simulation to validate. Cisco's version likely has timing constraints, so expect binary search.
What's the most common mistake people make on this?+
Assuming a server becomes available immediately after serving one request, without checking if it's actually free when the next request arrives. You need to track server free-times explicitly and assign each request to the earliest available server.
Should I sort the requests first?+
Yes, almost always. Sort by arrival time (or start time). Then for each request in order, find which server is free earliest and assign it. This greedy assignment is the core of the solution.
How do I check if N servers are enough in the simulation?+
Maintain a min-heap of server free-times. For each request, pop the server that will be free soonest, assign the request to it, and push its new free-time back. If the free-time is after the request deadline, return false.
How much time do I have to code this?+
The full solution (binary search plus heap simulation) takes 20-30 minutes for most people. If you blank on the structure, StealthCoder will show you the pattern so you can scaffold it in the remaining time.