@testset "218.the-skyline-problem.jl" begin
    @test get_skyline([[2, 9, 10], [3, 7, 15], [5, 12, 12], [15, 20, 10], [19, 24, 8]]) ==
          [(2, 10), (3, 15), (7, 12), (12, 0), (15, 10), (20, 8), (24, 0)]
    @test get_skyline([[0, 2, 3], [2, 5, 3]]) == [(0, 3), (5, 0)]
end