refactor: simplify the solution for the 5th day of AOC
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1 changed files with 16 additions and 45 deletions
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@ -51,65 +51,36 @@ class Solution05(lines: List<String>) {
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ranges.add(LongRange(seeds[i], seeds[i] + seeds[i+1] - 1))
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}
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for (map in maps) {
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var minCheckedValue = Long.MIN_VALUE
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val newList = mutableListOf<LongRange>()
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for (mapper in map.mappers.sortedBy{it.sourceRangeStart}) {
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//
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val mapperEnd = mapper.sourceRangeStart + mapper.rangeLength - 1
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val diff = mapper.destRangeStart - mapper.sourceRangeStart
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// find all values before this range.
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val unmatchedValues = ranges
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.filter{it.first < mapper.sourceRangeStart}
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.map{LongRange(max(minCheckedValue, it.first), min(mapper.sourceRangeStart - 1, it.last))}
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.map{
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LongRange(
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max(minCheckedValue, it.first),
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min(mapper.sourceRangeStart - 1, it.last),
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(unmatchedValues)
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// map values
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val overlappingLeftValues = ranges
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.filter{it.first < mapper.sourceRangeStart && it.last >= mapper.sourceRangeStart && it.last <= mapperEnd}
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.map{
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LongRange(
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max(mapper.sourceRangeStart, it.first) + diff,
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it.last + diff,
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(overlappingLeftValues)
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val overlappingMiddleValues = ranges
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.filter{it.first >= mapper.sourceRangeStart && it.last <= mapperEnd}
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.map{
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LongRange(
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it.first + diff, it.last + diff
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(overlappingMiddleValues)
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val overlappingRightValues = ranges
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.filter{it.first >= mapper.sourceRangeStart && it.first <= mapperEnd && it.last >= mapperEnd}
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.map{
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LongRange(
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it.first + diff,
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min(it.last, mapperEnd) + diff
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(overlappingRightValues)
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val bigRanges = ranges
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.filter{it.first < mapper.sourceRangeStart && it.last > mapperEnd}
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.map{
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LongRange(
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mapper.sourceRangeStart + diff, mapperEnd + diff
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(bigRanges)
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newList.addAll(
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ranges
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.map{
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LongRange(
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max(mapper.sourceRangeStart, it.first) + diff,
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min(mapperEnd, it.last) + diff,
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)
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}
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.filter{it.first <= it.last}
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)
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minCheckedValue = mapperEnd + 1
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}
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