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#!/usr/bin/env julia
using Test: @test, @testset
function unique_number(ints::Vector{T})::Int where {T<:Integer}
numbercounts = Dict{T,Int}()
map(x -> numbercounts[x] = get(numbercounts, x, 0) + 1, ints)
indices = collect(keys(numbercounts))
indices[findfirst(x -> numbercounts[x] == 1, indices)]
end
@testset "unique number" begin
@test unique_number([3, 3, 1]) == 1
@test unique_number([3, 2, 4, 2, 4]) == 3
@test unique_number([1]) == 1
@test unique_number([4, 3, 1, 1, 1, 4]) == 3
end
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