feat(hireup): add Service Call Profiler as OA question A - #128
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A real OA needs more than two problems, and the set jumped straight to a prefix-imbalance argument. Service Call Profiler is a stack simulation that gives candidates a reachable opening problem. The OA is now A (EASY, stack) < B (MEDIUM, prefix sums) < C (HARD, tree rerooting). Stress tests cover 50k nested re-entries, which breaks recursive walks and any per-entry stack rescan, plus flat call logs across 2 and 100 services. Output stays a few hundred bytes, well inside the judge limit.
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Summary
A real OA needs more than two problems, and the previous set opened straight onto a prefix-imbalance argument. This adds Service Call Profiler as an approachable question A.
The OA is now a clean escalation:
Problem A
Given a single-threaded profiler log of
<id>:start:<t>/<id>:end:<t>entries, report each service's exclusive running time, excluding time spent paused on nested calls. End timestamps are inclusive, and a service may re-enter itself.Test coverage
Output is a few hundred bytes, well inside the judge's 2 MB limit.
Validation
tsc --noEmit, and 113 unit tests all pass