Dynamic Programming / 2Dhard70 minSecurity Engineer

Threat Grid Reliability DP

Security Engineer signal: grid DP + path optimization in a threat intel graph context. This is a ProdMatch-owned security engineer drill, framed as a May 2026 Ola Security Platform simulation, not a copied platform question.

Company context

Ola · Security Platform

Freshness

May 2026

Product surface

threat intel graph

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

Question

Model threat intel graph as a grid of processing zones. Move only right or down. Return the maximum reliability path score while avoiding blocked cells.

Input

Grid of scores with blocked cells marked -1.

Output

Maximum score from top-left to bottom-right, or -1.

Constraints

1 <= rows, cols <= 1000
Scores may be zero.
Start or end may be blocked.

Concepts

attack graphs
policy tries
anomaly detection
grid DP
path optimization
obstacle handling

[[5,1],[2,4]] -> 11

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

Blocked start/end must be handled before the loop.
Use the impossible sentinel consistently.

Next Similar Problems

Attack Grid Reliability DPhard Policy Grid Reliability DPhard Anomaly Grid Reliability DPhard