day5

day_5/data

@@ -0,0 +1,245 @@
+seeds: 3037945983 743948277 2623786093 391282324 195281306 62641412 769611781 377903357 2392990228 144218002 1179463071 45174621 2129467491 226193957 1994898626 92402726 1555863421 340215202 426882817 207194644
+
+seed-to-soil map:
+3078006360 2182201339 30483272
+803630304 624445326 165226844
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+
+soil-to-fertilizer map:
+2937874770 2957653952 339980892
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+
+fertilizer-to-water map:
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+2823248929 1150509810 118368045
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+
+water-to-light map:
+3846882465 367033980 98093832
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+
+light-to-temperature map:
+2777813298 2971073270 586210802
+1687968665 0 334152507
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+0 2095520416 192800212
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+
+temperature-to-humidity map:
+4072523312 605654847 17750681
+1174610018 540191835 65463012
+2038455907 3792024734 100202248
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+
+humidity-to-location map:
+2848734682 2982177676 22285660
+3380476660 3717224958 24199873
+3201930685 734568132 100088122
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+428501331 65877217 276285378
+2482898505 3841187209 36728035

day_5/impl.rb

@@ -0,0 +1,50 @@
+#prepare the input which is a string containing new lines
+def parse(input)
+  data = []
+  map = []
+  input.each_line do |line|
+    if data.empty?
+      data << line.split(":").last.split(" ").map(&:to_i)
+      next
+    end
+    if line.include?(":") && !map.empty?
+      puts map
+      data << map
+      map = []
+      next
+    end
+    next if line.include?(":")
+    next if line.strip.empty?
+    # build the map
+    target,source,ranges = line.split(" ").map(&:to_i)
+    diff = target-source
+    map << [source,ranges,diff]
+  end
+  data << map
+  data
+end
+
+# result should a single string or integer
+def calculate(data)
+  seeds = nil
+  data.each do |d|
+    if seeds.nil?
+      seeds = d
+      next
+    end
+    # start mapping
+    new_seeds = seeds.map do |seed|
+      mapped = seed
+      d.each do |mapping|
+        source,ranges,diff = mapping
+        if source <= seed && seed <= source + ranges
+          mapped = seed + diff
+          break
+        end
+      end
+      mapped
+    end
+    seeds = new_seeds
+  end
+  seeds.min
+end

day_5/impl_2.rb

@@ -0,0 +1,109 @@
+#prepare the input which is a string containing new lines
+def parse(input)
+  data = []
+  map = []
+  input.each_line do |line|
+    if data.empty?
+      seed_ranges = []
+      seeds = line.split(":").last.split(" ").map(&:to_i)
+      (seeds.length/2).times do |i|
+        seed_ranges << [seeds[2*i],seeds[2*i+1]]
+      end
+      data << seed_ranges
+      next
+    end
+    if line.include?(":") && !map.empty?
+      data << map
+      map = []
+      next
+    end
+    next if line.include?(":")
+    next if line.strip.empty?
+    # build the map
+    target,source,ranges = line.split(" ").map(&:to_i)
+    diff = target-source
+    map << [source,ranges,diff]
+  end
+  data << map
+  data
+end
+
+# result should a single string or integer
+def calculate(data)
+  seeds = nil
+  data.each do |d|
+    if seeds.nil?
+      seeds = d
+      next
+    end
+    # start mapping
+    i=0
+    d.each do |mapping|
+      new_seeds = []
+      map_start,map_range,diff = mapping
+      map_end = map_start + map_range -1
+
+      puts "map: #{map_start}--#{map_end} doing #{diff}"
+      seeds.each do |seed_pair|
+        seed_start,seed_range = seed_pair
+        seed_end = seed_start+seed_range
+
+        # <---|---|--->
+        if seed_start <= map_start && map_end <= seed_end
+          puts "<---|---|--->"
+          new_seed_start = seed_start
+          new_seed_range = map_start - seed_start
+          additional_start = map_start + diff
+          additional_range = map_end - map_start
+          third_start = map_end
+          third_end = seed_end - map_end
+          new_seeds << [new_seed_start,new_seed_range]
+          new_seeds << [additional_start,additional_range]
+          new_seeds << [third_start,third_end]
+          next
+        end
+
+        # |---<---|--->
+        if map_start <= seed_start && map_end >= seed_start && map_end <= seed_end
+          puts "|---<---|--->"
+          new_seed_start = seed_start + diff
+          new_seed_range = map_end - seed_start
+          additional_start = map_end
+          additional_range = seed_end - map_end
+          new_seeds << [new_seed_start,new_seed_range]
+          new_seeds << [additional_start,additional_range]
+          next
+        end
+
+        # <---|--->---|
+        if seed_start <= map_start && seed_end >= map_start && seed_end <= map_end
+          puts "<---|--->---|"
+          new_seed_start = seed_start
+          new_seed_range = map_start - seed_start
+          additional_start = map_start + diff
+          additional_range = seed_end - map_start
+          new_seeds << [new_seed_start,new_seed_range]
+          new_seeds << [additional_start,additional_range]
+          next
+        end
+        # |---<-->---|
+        if map_start <= seed_start && seed_end <= map_end
+          puts "|---<-->---|"
+          new_seed_start = seed_start + diff
+          new_seed_range = seed_range
+          new_seeds << [new_seed_start,new_seed_range]
+          next
+        end
+
+        # else
+        new_seeds << seed_pair
+      end
+      pp new_seeds
+      seeds = new_seeds
+    end
+    break if i==1
+    i+=1
+  end
+  seeds = seeds.map{|seed_pair| seed_pair[0]}
+  seeds.min
+end

day_5/run.rb

@@ -0,0 +1,24 @@
+if ARGV[0] == "2"
+  require_relative "impl_2"
+else
+  require_relative "impl"
+end
+
+
+def print(result)
+  if result.is_a? Array
+    result.map! {|l| "#{l}\n" } 
+  end
+  
+  puts result
+end
+
+def run
+  puts "running your implementation"
+  input = File.new("day_5/data").read
+  data = parse(input)
+  result = calculate(data)
+  print(result)
+end
+
+run

day_5/test.rb

@@ -0,0 +1,59 @@
+if ARGV[0] == "2"
+  require_relative "impl_2"
+  RESULT = 46
+else
+  require_relative "impl"
+  RESULT = 35
+end
+
+
+INPUT = <<~IN
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4
+IN
+
+def test_example
+  parsed = parse(INPUT)
+  result = calculate(parsed)
+
+  if result == RESULT
+    puts "Test successful. Now run with real input"
+    puts "ruby day_5/run.rb #{ARGV[0]}"
+  else
+    puts "Test failed"
+    puts "expected \"#{RESULT}\" got \"#{result}\""
+  end
+end
+
+test_example