How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a Medium difficulty Coding & Algorithms question, commonly asked during Technical Screen rounds at DoorDash.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at DoorDash during technical interviews.

Compute earliest arrival in time-grid

Last updated: Mar 29, 2026

Quick Overview

This question evaluates algorithmic problem-solving and pathfinding skills on grid-based graphs, focusing on modeling time-dependent traversal constraints and reasoning about efficient search and supporting data structures.

Medium
DoorDash
Coding & Algorithms
Software Engineer

DoorDash

Aug 4, 2025, 10:55 AM

Software Engineer

Technical Screen

Coding & Algorithms

Question

LeetCode 778. Swim in Rising Water – Given an n x n integer grid where grid[i][j] is the earliest time you can enter the cell, starting from (0, 0) move 4-directionally only when the current time is ≥ the target cell's value; find the minimum time to reach (n-1,n- 1).

https://leetcode.com/problems/swim-in-rising-water/description/

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