Calculate Truck Distance
Reported by candidates from Amazon's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Amazon's truck distance problem landed in November 2024 OAs, and it's testing whether you can model a real-world logistics constraint in code. You're given truck movements and need to calculate total distance traveled. The trap is assuming a simple sum works. It doesn't. You need to track position state, handle coordinate geometry, or parse movement sequences carefully. If you blank on the live OA, StealthCoder will read the exact problem statement and walk you through the model in seconds.
Pattern and pitfall
The pattern here is simulation with state tracking. You'll likely be given a sequence of truck movements (directions, distances, waypoints, or coordinates) and asked to return total distance. The trick: 'distance' isn't always what you add up. You might need to calculate Euclidean distance between waypoints, account for only certain types of movement, or reconstruct a path. Common mistake is treating the input as pre-computed distances instead of raw movements. Build a position tracker, update coordinates as you process each instruction, and calculate distances between states. This is a coordinate geometry + simulation hybrid. StealthCoder catches the exact input format and model in one frame, so you can code with confidence even if the problem wording is vague.
If this hits your live OA and you blank, StealthCoder solves it in seconds, invisible to the proctor.
You can drill Calculate Truck Distance cold, or you can hedge it. StealthCoder runs invisibly during screen share and surfaces a working solution in under 2 seconds. The proctor sees the IDE. They don't see what's behind it. Built by an Amazon engineer who would have shipped this the night before his JPMorgan OA if he'd had it.
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Amazon reuses patterns across OAs. Built by an Amazon engineer who would have shipped this the night before his JPMorgan OA if he'd had it. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Calculate Truck Distance FAQ
Is this asking me to sum distances or calculate position-to-position?+
Almost always the latter. You track the truck's state (x, y coordinates or a path) and compute Euclidean or Manhattan distance between waypoints. Don't assume distances are given directly in the input. Parse movements and derive distance from position changes.
What if the problem mentions directions like North, East, or compass bearings?+
Map each direction to a coordinate delta. North is +y, East is +x, etc. Update position after each move, then sum the distance between consecutive positions. Treat it as a 2D coordinate problem, not a string problem.
How do I handle edge cases like returning to the start or overlapping paths?+
Total distance counts every step the truck takes, even if it retraces. You're not looking for unique distance or shortest path. Sum all movements in order. Overlapping routes add to the total, not subtract.
Should I use Euclidean distance or Manhattan distance?+
The problem will hint at it. If it mentions 'straight line' or 'as the crow flies', use Euclidean (square root of sum of squared deltas). If it's grid-based or mentions 'blocks', use Manhattan (sum of absolute deltas).
Can I solve this in under 20 minutes if I understand the pattern?+
Yes. Once you parse the input and map movements to coordinates, it's two nested loops and a distance formula. The hard part is understanding what 'distance' means in the problem. That's where StealthCoder saves you on the live OA.