Year 2018 Day 1

tudorpavel · Oct 27, 2024 · bc9a4d8 · bc9a4d8
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diff --git a/2018/day01.rb b/2018/day01.rb
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+nums = STDIN.read.split("\n").map(&:to_i)
+puts nums.sum
+
+def part2(nums)
+  seen = Set.new
+  sum = 0
+  loop do
+    nums.each do |num|
+      return sum if seen.include?(sum)
+      seen.add(sum)
+      sum += num
+    end
+  end
+end
+
+puts part2(nums)
diff --git a/2018/examples/day01.txt b/2018/examples/day01.txt
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