Challenge: First Non-Repeating Integer in a List—Hashing

Try to solve the First Non-Repeating Integer in a List—Hashing problem.

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Statement

Given a list of integers, nums, find the first non-repeating integer in the list.

Constraints:

  • 1≤1 \leq nums.length ≤103\leq 10^3

  • −5000≤-5000 \leq nums[i] ≤5000\leq 5000

Examples

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