[Solved] Examine the following code snippet for the Maximum Units on a Truck problem:def maxUnits(boxTypes, truckSize): boxTypes.sort(key=lambda x:... | Greedy Algorithms

Greedy Algorithms - Maximum Units on a Truck

Examine the following code snippet for the Maximum Units on a Truck problem:

def maxUnits(boxTypes, truckSize):
    boxTypes.sort(key=lambda x: x[1])  # Sort ascending
    totalUnits = 0
    for count, units in boxTypes:
        if truckSize == 0:
            break
        boxes_to_take = min(count, truckSize)
        totalUnits += boxes_to_take * units
        truckSize -= boxes_to_take
    return totalUnits

What is the primary bug in this code?

AUsing min(count, truckSize) instead of max(count, truckSize)

BSorting boxTypes in ascending order instead of descending order

CNot checking if truckSize is negative before subtracting

DReturning totalUnits before processing all box types

Step-by-Step Solution

Solution:

Step 1: Understand the sorting order
The problem requires maximizing units loaded, so box types with higher units per box should be prioritized.
Step 2: Identify sorting mistake
The code sorts boxTypes in ascending order by units, which causes the algorithm to pick boxes with fewer units first, leading to suboptimal results.
Step 3: Other code parts
The use of min(count, truckSize) is correct to avoid overloading, and the truckSize check is sufficient.
Final Answer:
Option B -> Option B
Quick Check:
Sort descending to maximize units [OK]

Quick Trick: Sort descending by units per box to maximize total units [OK]

Common Mistakes:

MISTAKES

Confusing min and max in boxes_to_take calculation
Ignoring sorting order impact
Assuming truckSize can be negative

Trap Explanation:

PITFALL

Ascending sort looks plausible but leads to suboptimal loading

Interviewer Note:

CONTEXT

Tests ability to spot subtle bugs in sorting logic

Master "Maximum Units on a Truck" in Greedy Algorithms

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More Greedy Algorithms Quizzes

Examine the following code snippet for the Maximum Units on a Truck problem:

Step 1: Understand the sorting order

Step 2: Identify sorting mistake

Step 3: Other code parts

Final Answer:

Quick Check:

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