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isperm

isperm(v) -> Bool

Returns true if v is a valid permutation.

Examples

1. Check if an array is a valid permutation:

   julia> isperm([2, 1, 3])
   true

   This example returns true because [2, 1, 3] is a valid permutation.

2. Handle edge cases with repeated elements:

   julia> isperm([1, 2, 2])
   false

   It returns false because [1, 2, 2] is not a valid permutation due to the repeated element 2.

3. Check if a range is a valid permutation:

   julia> isperm(1:4)
   true

   It returns true because 1:4 is a valid permutation.

Common mistake example:

julia> isperm([3, 1, 4])
false

In this example, the array [3, 1, 4] is not a valid permutation because it does not contain the element 2. It's important to ensure that a valid permutation should include all elements from 1 to n, where n is the length of the collection.

See Also

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