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https://github.com/onyx-and-iris/aoc2024.git
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39 lines
824 B
Go
39 lines
824 B
Go
package two
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import (
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"bytes"
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"math"
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"github.com/onyx-and-iris/aoc2024/day-20/internal/one"
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"github.com/onyx-and-iris/aoc2024/day-20/internal/point"
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log "github.com/sirupsen/logrus"
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)
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func Solve(buf []byte) (int, error) {
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r := bytes.NewReader(buf)
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graph, err := parseLines(r)
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if err != nil {
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return 0, err
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}
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log.Debugf("\n%s\n", graph.debug(one.Path))
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var count int
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for pair1 := one.Path.Front(); pair1 != nil; pair1 = pair1.Next() {
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for pair2 := one.Path.Front(); pair2 != nil; pair2 = pair2.Next() {
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if manhatten(pair1.Key, pair2.Key) > 20 ||
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pair1.Value-pair2.Value-manhatten(pair1.Key, pair2.Key) < 100 {
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continue
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}
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count++
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}
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}
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return count, nil
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}
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func manhatten(a, b point.Point) int {
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return int(math.Abs(float64(a.X)-float64(b.X)) + math.Abs(float64(a.Y)-float64(b.Y)))
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}
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