Detect Array Duplicate
ARRAY
HASH TABLE
Problem
Given a list of integers nums
, determine whether any number appears more than once.
If any value is repeated, return true
; otherwise, return false
, indicating all elements in the array are unique.
Examples
hasDuplicates([4, 5, 6, 7]) // return false hasDuplicates([10, 20, 10, 30]) // return true
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