129 lines
2.4 KiB
Go
129 lines
2.4 KiB
Go
package day01
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import (
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"adventofcode2025/utils"
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"fmt"
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"strings"
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)
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type Dir int
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const (
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Left Dir = iota
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Right
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Safe
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Unsafe
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)
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type Instruction struct {
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Turn Dir
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Steps int
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}
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func Part1(input string) int {
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lines := strings.Split(input, "\n")
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position := 50
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code := 0
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Instructions := make([]Instruction, 0)
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for _, line := range lines {
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var steps int
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var dir Dir
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switch line[0] {
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case 'L':
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steps = utils.MustAtoi(line[1:])
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dir = Left
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case 'R':
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steps = utils.MustAtoi(line[1:])
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dir = Right
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default:
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fmt.Println("Invalid direction")
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continue
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}
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if steps > 100 {
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steps = steps % 100
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}
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Instructions = append(Instructions, Instruction{Turn: dir, Steps: steps})
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}
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fmt.Print(Instructions)
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for _, instr := range Instructions {
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if instr.Turn == Left {
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if position-instr.Steps < 0 {
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position = 100 + (position - instr.Steps)
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} else {
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position -= instr.Steps
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}
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} else if instr.Turn == Right {
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if position+instr.Steps >= 100 {
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position = (position + instr.Steps) - 100
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} else {
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position += instr.Steps
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}
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}
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fmt.Println("\n", instr.Turn, instr.Steps, "->", position)
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if position == 0 {
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code++
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}
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}
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return code
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}
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func Part2(input string) int {
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lines := strings.Split(input, "\n")
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position := 50
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code := 0
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Instructions := make([]Instruction, 0)
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for _, line := range lines {
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var steps int
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var dir Dir
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switch line[0] {
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case 'L':
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steps = utils.MustAtoi(line[1:])
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dir = Left
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case 'R':
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steps = utils.MustAtoi(line[1:])
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dir = Right
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default:
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fmt.Println("Invalid direction")
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continue
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}
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Instructions = append(Instructions, Instruction{Turn: dir, Steps: steps})
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}
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fmt.Print(Instructions)
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for _, instr := range Instructions {
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if instr.Steps > 100 {
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code = code + (instr.Steps / 100)
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instr.Steps = instr.Steps % 100
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}
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if instr.Turn == Left {
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if position-instr.Steps < 0 {
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if position != 0 {
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code++
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}
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position = 100 + (position - instr.Steps)
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} else {
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position -= instr.Steps
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if position == 0 {
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code++
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}
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}
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} else if instr.Turn == Right {
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if position+instr.Steps > 99 {
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if position != 0 {
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code++
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}
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position = (position + instr.Steps) - 100
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} else {
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position += instr.Steps
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if position == 0 {
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code++
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}
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}
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}
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fmt.Println("\n", instr.Turn, instr.Steps, "->", position, "code:", code)
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}
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return code
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}
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