Graphshard70 minSecurity Engineer

ACL Evidence Path Finder

Security Engineer signal: shortest path + weighted graph in a permission minimizer context. This is a ProdMatch-owned security engineer drill, framed as a May 2026 Postman Zero Trust simulation, not a copied platform question.

Company context

Postman · Zero Trust

Freshness

May 2026

Product surface

permission minimizer

ProdMatch interview simulation based on product-team patterns; not a claim of a real company question.

Question

In permission minimizer, entities are connected by weighted evidence edges. For each query, find the least-cost evidence path from source to target while avoiding blocked entities.

Input

Weighted graph, blocked set, and q source-target queries.

Output

Minimum cost per query, or -1 if unreachable.

Constraints

1 <= nodes <= 100000
1 <= edges <= 300000
1 <= queries <= 100000
All weights are non-negative.

Concepts

attack graphs
policy tries
anomaly detection
shortest path
weighted graph
retrieval quality

0-1 cost 2, 1-2 cost 3, query 0->2 -> 5

Approach

Try framing your own approach first. The 30 seconds you think before peeking is where learning happens.

Clean Solution

Reveal the approach first.

How well did you understand?

Your rating tunes when this problem shows up again.

Common Mistakes

Mark visited when enqueueing, not after repeated dequeue.
Do not ignore disconnected components if the product surface can have them.

Next Similar Problems

Attack Dependency DAG Recoverymedium Attack Evidence Path Finderhard Policy Dependency DAG Recoveryhard