217. Contains Duplicate

Given an array of integers, find if the array contains any duplicates.

Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.

Example 1:

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

Example 2:

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

Example 3:

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

# @lc code=start
using LeetCode

function contains_duplicate(nums::Vector{Int})::Bool
    hash_table = Int[]
    for i in nums
        !(i in hash_table) ? push!(hash_table, i) : return true
    end
    return false
end
# @lc code=end

contains_duplicate (generic function with 1 method)

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