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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Ivan R. 2024-01-07 01:59:16 +05:00 committed by GitHub
parent 67d56fead6
commit a0531d2e68
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class Solution03(private val lines: List<String>) {
/** Maximum value of J = number of columns - 1.
* If j is less than jMax, then j can be safely incremented.
* */
private val jMax = lines[0].length - 1
/** Array to simplify character classification. */
private val digits = arrayOf('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')
/** Part 1. */
fun getSumOfParts(): Int {
var sum = 0
var buf = ""
var isBufferAdjacent = false
for (i in lines.indices) {
for (j in lines[i].indices) {
if (digits.contains(lines[i][j])) {
buf += lines[i][j]
// Mark current buffer as adjacent to a symbol if necessary.
if (getAdjacentSymbols(i, j, ::isSymbol).isNotEmpty()) {
isBufferAdjacent = true
}
// Skip number parsing if it's not the end of string.
if (j < jMax) continue
}
if (buf.isNotEmpty() && isBufferAdjacent) {
sum += buf.toInt()
}
buf = ""
isBufferAdjacent = false
}
}
return sum
}
/** Part 2. */
fun getGearRatioSum(): Int {
/**
* 2d array with a list of adjacent numbers for every asterisk.
*/
val adjacentNumbers = Array(lines.size) {
Array(lines[0].length){
mutableListOf<Int>()
}
}
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)

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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)
}
}