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Contains Duplicate

EasyHash Mapk-hash-mapLC #217

Problem

Contains Duplicate

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.

Example 1:

Input: nums = [1,2,3,1]
Output: true

Example 2:

Input: nums = [1,2,3,4]
Output: false

Example 3:

Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true

Constraints:

  • 1 ≤ nums.length ≤ 10⁵
  • -10⁹ ≤ nums[i] ≤ 10⁹