Solve the third day of AOC-23 (#1)
* Add (non-working) solution to day 3 of advent of code * Fix part 1 * Finish third day
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140
advent-of-code-2023/inputs/day-03/input.txt
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140
advent-of-code-2023/inputs/day-03/input.txt
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advent-of-code-2023/inputs/day-03/test.txt
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advent-of-code-2023/inputs/day-03/test.txt
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.664.598..
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advent-of-code-2023/src/main/kotlin/Solution03.kt
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advent-of-code-2023/src/main/kotlin/Solution03.kt
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class Solution03(private val lines: List<String>) {
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/** Maximum value of J = number of columns - 1.
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* If j is less than jMax, then j can be safely incremented.
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* */
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private val jMax = lines[0].length - 1
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/** Array to simplify character classification. */
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private val digits = arrayOf('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')
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/** Part 1. */
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fun getSumOfParts(): Int {
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var sum = 0
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var buf = ""
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var isBufferAdjacent = false
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for (i in lines.indices) {
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for (j in lines[i].indices) {
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if (digits.contains(lines[i][j])) {
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buf += lines[i][j]
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// Mark current buffer as adjacent to a symbol if necessary.
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if (getAdjacentSymbols(i, j, ::isSymbol).isNotEmpty()) {
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isBufferAdjacent = true
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}
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// Skip number parsing if it's not the end of string.
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if (j < jMax) continue
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}
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if (buf.isNotEmpty() && isBufferAdjacent) {
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sum += buf.toInt()
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}
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buf = ""
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isBufferAdjacent = false
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}
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}
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return sum
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}
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/** Part 2. */
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fun getGearRatioSum(): Int {
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/**
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* 2d array with a list of adjacent numbers for every asterisk.
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*/
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val adjacentNumbers = Array(lines.size) {
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Array(lines[0].length){
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mutableListOf<Int>()
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}
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}
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||||||
|
var buf = ""
|
||||||
|
val adjacentGears = mutableListOf<Coordinates>()
|
||||||
|
|
||||||
|
for (i in lines.indices) {
|
||||||
|
for (j in lines[i].indices) {
|
||||||
|
if (digits.contains(lines[i][j])) {
|
||||||
|
buf += lines[i][j]
|
||||||
|
|
||||||
|
// For every asterisk that is adjacent to the current digit
|
||||||
|
for (c in getAdjacentSymbols(i, j, ::isAsterisk)) {
|
||||||
|
// Check if we already added asterisk to our temporary list
|
||||||
|
var exists = false
|
||||||
|
for (gear in adjacentGears) {
|
||||||
|
if (gear.i == c.i && gear.j == c.j) exists = true
|
||||||
|
}
|
||||||
|
|
||||||
|
// Add new asterisk
|
||||||
|
if (!exists) adjacentGears.add(c)
|
||||||
|
}
|
||||||
|
|
||||||
|
if (j < jMax) continue
|
||||||
|
}
|
||||||
|
|
||||||
|
if (buf.isNotEmpty()) {
|
||||||
|
val num = buf.toInt()
|
||||||
|
for (adjacentGear in adjacentGears) {
|
||||||
|
// Add current buffer to the list of adjacent numbers.
|
||||||
|
adjacentNumbers[adjacentGear.i][adjacentGear.j].add(num)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
buf = ""
|
||||||
|
adjacentGears.clear()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
var sum = 0
|
||||||
|
|
||||||
|
for (i in adjacentNumbers.indices) {
|
||||||
|
for (j in adjacentNumbers[i].indices) {
|
||||||
|
if (adjacentNumbers[i][j].size == 2) {
|
||||||
|
sum += adjacentNumbers[i][j][0] * adjacentNumbers[i][j][1]
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return sum
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun getAdjacentSymbols(i: Int, j: Int, condition: (i: Int, j: Int) -> Boolean): List<Coordinates> {
|
||||||
|
val res = mutableListOf<Coordinates>()
|
||||||
|
|
||||||
|
if (i > 0) {
|
||||||
|
// Top
|
||||||
|
if (condition(i-1, j)) res.add(Coordinates(i-1, j))
|
||||||
|
|
||||||
|
// Top left
|
||||||
|
if (j > 0 && condition(i-1, j-1)) res.add(Coordinates(i-1, j-1))
|
||||||
|
|
||||||
|
// Top right
|
||||||
|
if (j < jMax && condition(i-1, j+1)) res.add(Coordinates(i-1, j+1))
|
||||||
|
}
|
||||||
|
|
||||||
|
if (i < lines.size - 1) {
|
||||||
|
// Bottom
|
||||||
|
if (condition(i+1, j)) res.add(Coordinates(i+1, j))
|
||||||
|
|
||||||
|
// Bottom left
|
||||||
|
if (j > 0 && condition(i+1, j-1)) res.add(Coordinates(i+1, j-1))
|
||||||
|
|
||||||
|
// Bottom right
|
||||||
|
if (j < jMax && condition(i+1,j+1)) res.add(Coordinates(i+1, j+1))
|
||||||
|
}
|
||||||
|
|
||||||
|
// Left
|
||||||
|
if (j > 0 && condition(i, j-1)) res.add(Coordinates(i, j-1))
|
||||||
|
|
||||||
|
// Right
|
||||||
|
if (j < jMax && condition(i, j+1)) res.add(Coordinates(i, j+1))
|
||||||
|
|
||||||
|
return res
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun isSymbol(i: Int, j: Int): Boolean {
|
||||||
|
if (digits.contains(lines[i][j])) return false
|
||||||
|
if (lines[i][j] == '.') return false
|
||||||
|
return true
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun isAsterisk(i: Int, j: Int): Boolean {
|
||||||
|
return lines[i][j] == '*'
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
class Coordinates(var i: Int, var j: Int)
|
||||||
37
advent-of-code-2023/src/test/kotlin/Solution03Test.kt
Normal file
37
advent-of-code-2023/src/test/kotlin/Solution03Test.kt
Normal file
|
|
@ -0,0 +1,37 @@
|
||||||
|
import java.io.File
|
||||||
|
import kotlin.test.Test
|
||||||
|
import kotlin.test.assertEquals
|
||||||
|
|
||||||
|
class Solution03Test {
|
||||||
|
@Test
|
||||||
|
fun testGetSumOfParts() {
|
||||||
|
val file = File("inputs/day-03/test.txt")
|
||||||
|
val instance = Solution03(file.readLines())
|
||||||
|
val res = instance.getSumOfParts()
|
||||||
|
assertEquals(4361, res)
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun solvePart1() {
|
||||||
|
val file = File("inputs/day-03/input.txt")
|
||||||
|
val instance = Solution03(file.readLines())
|
||||||
|
val res = instance.getSumOfParts()
|
||||||
|
println(res)
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun testGetGearRatio() {
|
||||||
|
val file = File("inputs/day-03/test.txt")
|
||||||
|
val instance = Solution03(file.readLines())
|
||||||
|
val res = instance.getGearRatioSum()
|
||||||
|
assertEquals(467835, res)
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun solvePart2() {
|
||||||
|
val file = File("inputs/day-03/input.txt")
|
||||||
|
val instance = Solution03(file.readLines())
|
||||||
|
val res = instance.getGearRatioSum()
|
||||||
|
println(res)
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue