Find Duplicate Values in Array

EasyPython

Problem

Given an integer array nums, return all values that appear more than once. Each duplicate should appear only once in the output, in the order it is first detected as a repeat during a left-to-right scan.

Constraints

1 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
Each duplicate value should appear at most once in the result

CodePython 3

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