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#0125
Arrange Letters With Repetition
MediumAptitude25 min20 XP
Problem
How many distinct arrangements can be made from the letters of LEVEL?
Why This Matters
Permutation formulas need adjustment when repeated items are indistinguishable.
Examples
Example 1
InputLEVEL
Output30
Divide by factorials of repeated letter counts.
Constraints
- Return the requested value exactly.
- Handle the stated edge cases.
- Keep the solution readable.
CodeReasoning
How many distinct arrangements can be made from the letters of LEVEL?
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Testcases1 visible / 3 hidden categories
Core example
InputLEVEL
Expected30
Divide by factorials of repeated letter counts.
Hidden Test Categories
all unique lettersone repeated letterall same letters