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day3
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‎bin/adventofcode2020

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‎bin/inputs/day3.txt

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‎src/day2.go

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@@ -6,7 +6,7 @@ import (
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"strings"
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)
88

9-
// SolveDay2 solves the puzzle for day1
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// SolveDay2 solves the puzzle for day 2
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func SolveDay2(part int, lines *[]string) {
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switch p := part; p {
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case 1:

‎src/day3.go

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package main
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import (
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"fmt"
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)
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// SolveDay3 solves the puzzle for day 3
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func SolveDay3(part int, lines *[]string) {
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switch p := part; p {
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case 1:
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solveDay3Part1(lines)
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case 2:
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solveDay3Part2(lines)
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}
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}
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func solveDay3Part1(lines *[]string) {
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solution := 0
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solution = solveDay3SlopeRun(lines, 1, 3)
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fmt.Println(solution)
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}
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func solveDay3Part2(lines *[]string) {
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solution := 0
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down1right1 := solveDay3SlopeRun(lines, 1, 1)
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down1right3 := solveDay3SlopeRun(lines, 1, 3)
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down1right5 := solveDay3SlopeRun(lines, 1, 5)
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down1right7 := solveDay3SlopeRun(lines, 1, 7)
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down2right1 := solveDay3SlopeRun(lines, 2, 1)
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solution = down1right1 * down1right3 * down1right5 * down1right7 * down2right1
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fmt.Println(solution)
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}
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func solveDay3SlopeRun(lines *[]string, down int, right int) int {
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solution := 0
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for i := 0; i < len(*lines); i += down {
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line := (*lines)[i]
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treePos := (i / down * right) % len(line)
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character := string(line[treePos])
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if character == "#" {
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solution++
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}
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}
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return solution
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}

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