remove hard coded magic numbers to solve sample inputs

Author: akdemironur

01/sample_input_A

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

01/sample_input_B

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

02/sample_input

@@ -0,0 +1,5 @@
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green

03/sample_input

@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..

03/sol.exs

@@ -51,9 +51,11 @@ defmodule Day03 do
         do: {x, y}
   end
 
-  defp extract_part_numbers(_, {140, 0}, _, _, part_numbers), do: part_numbers
+  defp extract_part_numbers(board, {r, 0}, _, _, part_numbers) when length(board) == r,
+    do: part_numbers
 
-  defp extract_part_numbers(board, {r, 140}, current_number, is_part_number, part_numbers) do
+  defp extract_part_numbers(board, {r, c}, current_number, is_part_number, part_numbers)
+       when length(hd(board)) == c do
     if is_part_number do
       extract_part_numbers(board, {r + 1, 0}, 0, false, [current_number | part_numbers])
     else
@@ -108,7 +110,7 @@ defmodule Day03 do
       |> Enum.reverse()
 
     right =
-      Enum.slice(row, c + 1, 140)
+      Enum.slice(row, c + 1, length(row) - c - 1)
       |> Enum.take_while(fn x -> x >= 48 and x <= 57 end)
 
     center = Enum.at(row, c, 46)
@@ -126,10 +128,9 @@ defmodule Day03 do
         parse_ratios({r + 1, c}, board) ++
         parse_ratios({r - 1, c}, board)
 
-    if length(all_numbers) == 2 do
-      Enum.product(all_numbers)
-    else
-      0
+    cond do
+      length(all_numbers) == 2 -> Enum.product(all_numbers)
+      true -> 0
     end
   end
 end