pythonLogic errorMediumDay 24 of 30

Biggest gap between numbers comes out as -1

Time: 0:00

BugFind the bug and fix the code

What it should do

largest_gap(nums) returns the biggest jump between neighbouring numbers in a list that goes up. Example: largest_gap([1, 5, 6]) → 4.

What happens instead

largest_gap([1, 5, 6]) returns -1.

def largest_gap(nums):
    gaps = []
    for i in range(len(nums) - 1):
        gaps.append(nums[i] - nums[i + 1])
    return max(gaps)

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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pythonLogic errorMediumDay 24 of 30

Biggest gap between numbers comes out as -1

Time: 0:00

BugFind the bug and fix the code

What it should do

largest_gap(nums) returns the biggest jump between neighbouring numbers in a list that goes up. Example: largest_gap([1, 5, 6]) → 4.

What happens instead

largest_gap([1, 5, 6]) returns -1.

def largest_gap(nums):
    gaps = []
    for i in range(len(nums) - 1):
        gaps.append(nums[i] - nums[i + 1])
    return max(gaps)

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

Biggest gap between numbers comes out as -1

What it should do

What happens instead

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Biggest gap between numbers comes out as -1

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