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Contains Duplicate
EasyVerifiedSetArrayHash Map~10 min
Given an integer array nums, return true if any value appears at least twice.
Track values seen so far in a set; a repeat means a duplicate.
The input arrives as a single array nums.
Examples
in[1, 2, 3, 1]
outtrue
1 appears twice.
in[1, 2, 3, 4]
outfalse
All values are distinct.
Constraints
- 1 ≤ nums.length ≤ 10⁵
- -10⁹ ≤ nums[i] ≤ 10⁹
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