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defmodule LuckyNumber do
def lucky_number(matrix) do
mm = min_max(matrix)
if mm == max_min(matrix), do: mm, else: -1
end
def min_max(matrix) do
matrix
|> Stream.map(&Enum.min/1)
|> Enum.max()
end
def max_min(matrix) do
matrix
|> Stream.zip_with(&Enum.max/1)
|> Enum.min()
end
end
ExUnit.start()
defmodule LuckyNumbersTest do
use ExUnit.Case
test "matrix 3x3" do
matrix = [
[3, 7, 8],
[9, 11, 13],
[15, 16, 17]
]
assert LuckyNumber.min_max(matrix) == 15
assert LuckyNumber.max_min(matrix) == 15
assert LuckyNumber.lucky_number(matrix) == 15
end
test "matrix 4x4" do
matrix = [
[ 1, 10, 4, 2],
[ 9, 3, 8, 7],
[15, 16, 17, 12]
]
assert LuckyNumber.min_max(matrix) == 12
assert LuckyNumber.max_min(matrix) == 12
assert LuckyNumber.lucky_number(matrix) == 12
end
test "matrix 2x2" do
matrix = [
[7, 8],
[1, 2]
]
assert LuckyNumber.min_max(matrix) == 7
assert LuckyNumber.max_min(matrix) == 7
assert LuckyNumber.lucky_number(matrix) == 7
end
test "matrix 2x2 withou lucky number" do
matrix = [
[7, 2],
[1, 4]
]
assert LuckyNumber.min_max(matrix) == 2
assert LuckyNumber.max_min(matrix) == 4
assert LuckyNumber.lucky_number(matrix) == -1
end
end
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