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+...........919*.....................................*.......234.........492..%...........300...........301........./866..........*.......... +...............470.....440.874...116....240........299......................27......409.......................................639.136....... diff --git a/advent-of-code-2023/inputs/day-03/test.txt b/advent-of-code-2023/inputs/day-03/test.txt new file mode 100644 index 0000000..b20187f --- /dev/null +++ b/advent-of-code-2023/inputs/day-03/test.txt @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.. diff --git a/advent-of-code-2023/src/main/kotlin/Solution03.kt b/advent-of-code-2023/src/main/kotlin/Solution03.kt new file mode 100644 index 0000000..3c9a88a --- /dev/null +++ b/advent-of-code-2023/src/main/kotlin/Solution03.kt @@ -0,0 +1,148 @@ +class Solution03(private val lines: List) { + + /** 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() + } + } + + var buf = "" + val adjacentGears = mutableListOf() + + 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 { + val res = mutableListOf() + + 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) \ No newline at end of file diff --git a/advent-of-code-2023/src/test/kotlin/Solution03Test.kt b/advent-of-code-2023/src/test/kotlin/Solution03Test.kt new file mode 100644 index 0000000..69aacfe --- /dev/null +++ b/advent-of-code-2023/src/test/kotlin/Solution03Test.kt @@ -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) + } +}