Dynamic Programming / 2Dmedium45 minPlatform Engineer

SDK Grid Reliability DP

Platform Engineer signal: grid DP + path optimization in a SDK compatibility matrix context. This is a ProdMatch-owned platform engineer drill, framed as a May 2026 Practo Platform SDK simulation, not a copied platform question.

Company context

Practo · Platform SDK

Freshness

May 2026

Product surface

SDK compatibility matrix

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

Question

Model SDK compatibility matrix 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

build DAGs
tenant quotas
artifact caching
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

Build Grid Reliability DPhard Artifacts Grid Reliability DPhard Tenancy Grid Reliability DPhard