Return `true` if any value appears at least twice in `nums`. Variant **#19**.
Example 1
Input: nums = [19,20,21,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
Output: true
Constraints
Acceptance: 64% · Topics: hash-table, array
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