2023 Day 1 in Ruby

2023/base/p1.rb

@@ -0,0 +1,5 @@
+res = 0
+File.foreach("./2023/base/data") do |line|
+
+end
+puts res

2023/base/p2.rb

@@ -0,0 +1,5 @@
+res = 0
+File.foreach("./2023/base/data") do |line|
+
+end
+puts res

2023/day1/p1.rb

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+res = 0
+File.foreach("./2023/day1/data") do |line|
+  first_int = -1
+  last_int = -1
+  line.each_byte do |b|
+    first_int = b - 48 if first_int == -1  and b > 47 and b < 58
+    last_int = b - 48 if b > 47 and b < 58
+  end
+  res += first_int * 10 + last_int
+end
+puts res

2023/day1/p2.rb

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+res = 0
+numbers = %w[one two three four five six seven eight nine]
+
+File.foreach("./2023/day1/data") do |line|
+  first_digit_index = 10000
+  first_digit = 0
+  last_digit_index = -1
+  last_digit = 0
+
+  (1..9).each do |int|
+    next if (line.index int.to_s).nil?
+    if (line.index int.to_s) < first_digit_index
+      first_digit_index = line.index int.to_s
+      first_digit = int
+    end
+
+    if (line.rindex int.to_s) > last_digit_index
+      last_digit_index = line.rindex int.to_s
+      last_digit = int
+    end
+  end
+
+  numbers.each_with_index do |int, index|
+    next if (line.rindex int).nil?
+    if (line.index int) < first_digit_index
+      first_digit_index = line.index int
+      first_digit = index + 1
+    end
+
+    if (line.rindex int) > last_digit_index
+      last_digit_index = line.rindex int
+      last_digit = index + 1
+    end
+  end
+
+  res += first_digit * 10 + last_digit
+end
+
+puts res