Add comment with complete algorithm for part 2

src/main/java/com/jonathanmorris/challenges/Day05Challenge.java

@@ -23,6 +23,75 @@ public class Day05Challenge implements Challenge {
  "temperature-to-humidity",
  "humidity-to-location");
 
+ // Possible solution for part 2
+ // 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
+ //
+ // range = [start, end, displacement]
+ // make seed ranges, e.g.:
+ // [79, 92, null]
+ // ranges for soil are:
+ // -> [[98, 99, -48], [50, 97, +2]]
+ // overlaps: [[79, 92]]
+ // destinations for [79, 92] are: [81, 94]
+ // ranges for fertilizer are:
+ // -> [[15, 51, -15], [52, 53, -15], [0, 14, +39]]
+ // intersects with nothing, so it's still [81, 94]
+ // destinations for [81, 94] are: [81, 94] (no change since no overlaps)
+ // ranges for water are:
+ // -> [[53, 60, -4], [11, 52, -11], [0, 6, +42], [7, 10, +50]]
+ // intersects with nothing, so it's still [81, 94]
+ // destinations for [81, 94] are: [81, 94] (no change since no overlaps)
+ // ranges for light are:
+ // -> [[18, 24, +70], [25, 94, -7]]
+ // so it intersects with [25, 94]
+ // overlaps: [[81, 94]] 
+ // destinations for [81, 94] are: [74, 87] 
+ // ranges for temperature are:
+ // -> [[77, 99, -32], [45, 63, +36], [64, 76, +4]]
+ // overlaps: [[74, 76], [77, 87]]
+ // destinations for [[74, 76], [77, 87]] are: [[78, 80], [45, 55]]
+ // ranges for humidity are:
+ // -> [[69, 69, -69], [0, 68, +1]]
+ // overlaps: [[78, 80], [45, 55]]
+ // destinations for [[78, 80], [45, 55]] are: [[78, 80], [46, 56]] 
+ // ranges for location are:
+ // -> [[56, 92, +4], [93, 96, -37]]
+ // overlaps: [[78, 80], [46, 56]]
+ // destinations for [[78, 80], [46, 56]] are: [82, 84], [46, 56]
+ // lowest value is 46, so answer is 46
+
  @Override
  public void execute(List<String> lines) {
  List<Long> seeds =
@@ -84,13 +153,19 @@ private Long getValue(Long val) {
  Long sourceNum = line.getSourceNum();
  Long destNum = line.getDestNum();
  Long rangeLength = line.getRangeLength();
+ logger.debug("sourceNum is {}", sourceNum);
+ logger.debug("destNum is {}", destNum);
+ logger.debug("rangeLength is {}", rangeLength);
+
  if (val >= sourceNum && val < sourceNum + rangeLength) {
  Long offset = val - sourceNum;
+ logger.debug("offset is {}", offset);
  Long result = destNum + offset;
  logger.debug("result is {}", result);
  return result;
  }
  }
+ logger.debug("result is {}", val);
  return val;
  }
  }