Easy

The Off-by-One Loop

~9 mindebugging

Fix count_above so it checks every value.

Examples

The last value is counted too

Input
count_above([5, 10], 1)
Output
2

Values equal to the threshold do not count, only strictly above

Input
count_above([1, 2, 3], 2)
Output
1

Nothing above the threshold gives 0

Input
count_above([1, 1, 1], 5)
Output
0

Hints

Hint 1

Walk the input once and accumulate as you go.

Hint 2

Watch for this: still skips last element.

Requirements

  • : a list of numbers

  • threshold: the number to compare against

  • Return How many values are above the threshold.

Constraints

  • Standard library only, no imports required

  • Time limit: 200 ms, Memory: 64 MB

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Intro
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Where this shows up

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3 employers weight this skill

2 frontier labs, 1 AI product company. Top match scores 80.

Python
def count_above(values, threshold):
    """
    Count how many values are strictly greater than threshold.

    This currently misses the last value. Fix it.

    Args:
        values: a list of numbers
        threshold: the number to compare against

    Returns:
        How many values are above the threshold.
    """
    count = 0
    for i in range(len(values) - 1):
        if values[i] > threshold:
            count += 1
    return count
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