From 1362f76e60c32a7bf0e7240b01524d16734f8dd4 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Fri, 25 Dec 2020 15:23:39 +0100
Subject: Add day 8

---
 08/b.rb | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 08/b.rb

(limited to '08/b.rb')

diff --git a/08/b.rb b/08/b.rb
new file mode 100644
index 0000000..ef4fce1
--- /dev/null
+++ b/08/b.rb
@@ -0,0 +1,46 @@
+code = []
+
+File.readlines('input.txt').each do |line|
+  instruction, number = line.split
+  code.push [instruction, number.to_i]
+end
+
+visited = {}
+current_line = 0
+acc = 0
+
+code.size.times do |i|
+  code_copy = code.map {|e| e.slice(0, 2)}
+  case code_copy[i][0]
+  when 'jmp'
+    code_copy[i][0] = 'nop'
+  when 'nop'
+    code_copy[i][0] = 'jmp'
+  end
+
+
+  visited = {}
+  current_line = 0
+  acc = 0
+
+  while !visited[current_line]
+    if current_line == code.size
+      puts acc
+      break
+    elsif current_line > code.size
+      puts 'incorrect run'
+      break
+    end
+
+    visited[current_line] = true
+    case code_copy[current_line][0]
+    when 'nop'
+      current_line += 1
+    when 'acc'
+      acc += code_copy[current_line][1]
+      current_line += 1
+    when 'jmp'
+      current_line += code_copy[current_line][1]
+    end
+  end
+end
-- 
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