82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
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package main
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import (
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"bufio"
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"os"
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"strings"
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"strconv"
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)
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func main() {
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reader := bufio.NewReader(os.Stdin);
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println("reading seeds")
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text, _ := reader.ReadString('\n')
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seeds := strings.Split(strings.Trim(strings.Split(text, ": ")[1], "\n"), " ");
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reader.ReadString('\n')
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mappers := [][]resMap{};
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for {
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line, _ := reader.ReadString('\n')
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if len(line) < 1 {
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break;
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}
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println("reading", line)
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mapper := []resMap{};
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for {
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nextLine, _ := reader.ReadString('\n');
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seedToSoil := strings.Split(strings.Trim(nextLine, "\n"), " ");
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if len(seedToSoil) != 3 {
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break;
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}
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destStart, _ := strconv.Atoi(seedToSoil[0]);
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srcStart, _ := strconv.Atoi(seedToSoil[1]);
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length, _ := strconv.Atoi(seedToSoil[2]);
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mapper = append(mapper, resMap{destStart,srcStart,length})
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}
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mappers = append(mappers, mapper)
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}
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smallest := 0;
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for _, seed := range seeds {
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loc, _ := strconv.Atoi(seed)
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newLoc := seedLoc(mappers, loc)
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if smallest == 0 || newLoc < smallest {
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smallest = newLoc
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}
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}
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println(smallest)
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}
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func seedLoc(mappers [][]resMap, source int) int {
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for _, m := range mappers {
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source = mapSeed(m, source)
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}
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return source
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}
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func mapSeed(soil []resMap, source int) (int) {
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for _, m := range soil {
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if source >= m.srcStart && source < m.srcStart + m.length {
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return m.destStart + (source - m.srcStart)
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}
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}
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return source
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}
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type resMap struct {
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destStart int
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srcStart int
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length int
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}
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