Dynamic Programming / 2Dhard70 minDevOps / SRE Engineer

Quota Grid Reliability DP

DevOps / SRE Engineer signal: grid DP + path optimization in a tenant quota scheduler context. This is a ProdMatch-owned devops sre drill, framed as a May 2026 Zoho Platform Ops simulation, not a copied platform question.

Company context

Zoho · Platform Ops

Freshness

May 2026

Product surface

tenant quota scheduler

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

Question

Model tenant quota scheduler 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

blast-radius graphs
alert dedupe
rolling windows
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

Incident Grid Reliability DPhard Deploy Grid Reliability DPhard Capacity Grid Reliability DPhard