How should I practice Count Three-Digit Numbers with Distinct Digits?

Start by reading the full statement, solve the visible examples, then compare the pattern against related ZipRecruiter online assessment problems in FastPrep.

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FastPrep tags this as a ZipRecruiter online assessment coding practice problem when the problem catalog has that company and stage context.

Count Three-Digit Numbers with Distinct Digits

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Problem statement

You are given an inclusive range [left, right] containing only three-digit positive integers.

Return how many values in the range have three pairwise distinct decimal digits.

Function

countDistinctThreeDigitNumbers(left: int, right: int) → int

Examples

Example 1

left = 876right = 890return = 3

The qualifying values are 876, 879, and 890.

Example 2

left = 100right = 105return = 4

The qualifying values are 102, 103, 104, and 105.

Constraints

100 <= left <= right <= 999