Day 1 solutions

Author: creideiki

01-1.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+from functools import reduce
+
+lines = [row.strip() for row in open('01.input').readlines()]
+
+left = []
+right = []
+
+for line in lines:
+    l, r = line.split()
+    left.append(int(l))
+    right.append(int(r))
+
+left.sort()
+right.sort()
+
+print(reduce(lambda x, y: x + y, map(lambda lr: abs(lr[0] - lr[1]), zip(left, right))))

01-1.rb

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+#!/usr/bin/env ruby
+
+lines = File.read('01.input').lines.map(&:strip)
+
+left = []
+right = []
+
+lines.each do |line|
+  l, r = line.split
+  left << l.to_i
+  right << r.to_i
+end
+
+left.sort!
+right.sort!
+
+puts left.zip(right).map { |l, r| (l - r).abs }.reduce &:+

01-2.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+from functools import reduce
+
+lines = [row.strip() for row in open('01.input').readlines()]
+
+left = []
+right = []
+
+for line in lines:
+    l, r = line.split()
+    left.append(int(l))
+    right.append(int(r))
+
+left.sort()
+right.sort()
+
+print(reduce(lambda x, y: x + y, map(lambda l: l * right.count(l), left)))

01-2.rb

@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+lines = File.read('01.input').lines.map(&:strip)
+
+left = []
+right = []
+
+lines.each do |line|
+  l, r = line.split
+  left << l.to_i
+  right << r.to_i
+end
+
+puts left.map { |l| l * right.count(l) }.reduce &:+