Dynamic Programming / 2Dmedium45 minFrontend Engineer

Player Grid Reliability DP

Frontend Engineer signal: grid DP + path optimization in a video player events context. This is a ProdMatch-owned frontend engineer drill, framed as a March 2026 Flipkart Media Web simulation, not a copied platform question.

Company context

Flipkart · Media Web

Freshness

March 2026

Product surface

video player events

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

Question

Model video player events 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

render scheduling
state graphs
virtualization
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.

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