Day 1 part 2 solutions

Author: creideiki

1-2.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+
+readings = [int(row) for row in open('1.input').readlines()]
+
+increments = 0
+win_size = 3
+last = sum(readings[0:win_size])
+
+for i in range(1, len(readings)):
+    win_sum = sum(readings[i:i + win_size])
+    if win_sum > last:
+        increments += 1
+    last = win_sum
+
+print(increments)

1-2.rb

@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+readings = File.read('1.input').lines.map(&:to_i)
+
+increments = 0
+win_size = 3
+last = readings[0..win_size - 1].sum
+
+1.upto(readings.size - win_size) do |i|
+  win_sum = readings[i..i + win_size - 1].sum
+  increments += 1 if win_sum > last
+  last = win_sum
+end
+
+print increments, "\n"