67 lines
934 B
Go
67 lines
934 B
Go
package main
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import (
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"bufio"
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"fmt"
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"math"
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"os"
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"strconv"
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"strings"
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)
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func main() {
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// too lazy for fancy algorithms
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var crabs []int
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topCrab := 0
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s := bufio.NewScanner(os.Stdin)
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s.Scan()
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for _, crabStr := range strings.Split(s.Text(), ",") {
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crab, _ := strconv.Atoi(crabStr)
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crabs = append(crabs, crab)
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if crab > topCrab {
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topCrab = crab
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}
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}
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// part 1
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bestFuel := math.MaxInt64
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for x := 0; x <= topCrab; x++ {
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fuel := 0
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for _, crab := range crabs {
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fuel += abs(crab - x)
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}
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if fuel < bestFuel {
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bestFuel = fuel
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}
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}
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fmt.Println(bestFuel)
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// part 2
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bestFuel2 := math.MaxInt64
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for x := 0; x <= topCrab; x++ {
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fuel := 0
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for _, crab := range crabs {
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diff := abs(crab - x)
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// triangular number
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fuel += (diff * (diff + 1)) / 2
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}
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if fuel < bestFuel2 {
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bestFuel2 = fuel
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}
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}
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fmt.Println(bestFuel2)
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}
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func abs(i int) int {
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if i < 0 {
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return -i
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}
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return i
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}
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