<!-- livebook:{"hub_id":"team-weiz"} -->
# Day07
```elixir
example = """
190: 10 19
3267: 81 40 27
83: 17 5
156: 15 6
7290: 6 8 6 15
161011: 16 10 13
192: 17 8 14
21037: 9 7 18 13
292: 11 6 16 20
"""
```
## Section
```elixir
defmodule Day07 do
def parse_input(input) do
input
|> String.split("\n", trim: true)
|> Enum.map(fn row ->
[raw_target, raw_numbers] = String.split(row, ": ", trim: true)
target = String.to_integer(raw_target)
numbers =
raw_numbers
|> String.split(" ", trim: true)
|> Enum.map(&String.to_integer/1)
{target, numbers}
end)
end
def part1(input) do
parse_input(input)
|> Enum.map(fn {target, numbers} ->
solve(numbers, [:add, :mult]) |> Enum.find(&(&1 == target))
end)
|> Enum.filter(& &1)
|> Enum.sum()
end
def part2(input) do
parse_input(input)
|> Enum.map(fn {target, numbers} ->
solve(numbers, [:add, :mult, :concat]) |> Enum.find(&(&1 == target))
end)
|> Enum.filter(& &1)
|> Enum.sum()
end
def solve(numbers, operators) do
numbers
|> Enum.reduce([], fn
n, [] ->
[n]
n, accs ->
for acc <- accs, operator <- operators do
apply(__MODULE__, operator, [acc, n])
end
end)
end
def add(a, b), do: a + b
def mult(a, b), do: a * b
def concat(a, b), do: String.to_integer("#{a}#{b}")
end
Day07.part1(example)
Day07.part2(example)
```
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