day 1

eds

@@ -1,25 +0,0 @@
-- [ ] V
-- [ ] Swift
-- [ ] Java
-- [ ] C++
-- [ ] Elle
-- [ ] Go
-- [ ] Rust
-- [ ] Dart
-- [ ] SQL
-- [ ] C
-- [ ] C#
-- [ ] Kotlin
-- [ ] PHP
-- [ ] JavaScript
-- [ ] Crystal
-- [ ] Bash
-- [ ] Nim
-- [ ] Perl
-- [ ] Haskell
-- [ ] Ruby
-- [ ] pwsh
-- [ ] F#
-- [ ] Python
-- [ ] Visual Basic
-- [ ] Zig

.gitignore

@@ -1,2 +1,3 @@
 testing/
-input.txt
+input.txt
+.idea/

2024/README.md

@@ -15,7 +15,7 @@ AOC but one programming language per day
 - [ ] SQL
 - [ ] C
 - [ ] C#
-- [ ] Kotlin
+- [x] 1: Kotlin (holy shit its actually a good lang)
 - [ ] PHP
 - [ ] JavaScript
 - [ ] Crystal

2024/day1/example.txt

@@ -0,0 +1,6 @@
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3

2024/day1/solution.kts

@@ -0,0 +1,92 @@
+#!/usr/bin/env kotlin
+
+import java.io.File
+import java.util.Scanner
+import kotlin.math.abs
+
+val expectedExampleAnswer = 11
+val secondExpectedExampleAnswer = 31
+
+fun useProd(): Boolean {
+    print("Run on (p)roduction values or on (e)xample values w/ a known answer? >")
+    val scanner = Scanner(System.`in`)
+    val result = scanner.next().single() == 'p'
+    if(result) {
+        print("Running in production mode\n\n")
+        return true
+    }
+    print("\nRunning in example mode, expected values are $expectedExampleAnswer and $secondExpectedExampleAnswer\n")
+    return false
+}
+
+fun getChallenge(): Char {
+    val scanner = Scanner(System.`in`)
+    print("Challenge (1) or (2)? >")
+    return scanner.next().single()
+}
+
+fun challenge1(input: String): Int {
+    val lines = input.split("\n")
+    var invalidLines = 0
+    val leftLocations: MutableList<Int> = mutableListOf()
+    val rightLocations: MutableList<Int> = mutableListOf()
+    var answer = 0
+    
+    for(line in lines) {
+        val locations = line.split("   ")
+        try {
+            leftLocations += locations[0].toInt()
+            rightLocations += locations[1].toInt()
+        }
+        catch(e: Exception) {
+            invalidLines++
+            continue
+        }
+    }
+    
+    for(i in 0..<lines.size - invalidLines) {
+        val minLeft = leftLocations.min()
+        val minRight = rightLocations.min()
+        leftLocations.remove(minLeft)
+        rightLocations.remove(minRight)
+        
+        answer += abs(minLeft - minRight)
+    }
+    
+    return answer
+}
+
+fun challenge2(input: String): Int {
+    val lines = input.split("\n")
+    var invalidLines = 0
+    val leftLocations: MutableList<Int> = mutableListOf()
+    var rightLocations: MutableList<Int> = mutableListOf()
+    var answer = 0
+    
+    for(line in lines) {
+        val locations = line.split("   ")
+        try {
+            leftLocations += locations[0].toInt()
+            rightLocations += locations[1].toInt()
+        }
+        catch(e: Exception) {
+            invalidLines++
+            continue
+        }
+    }
+
+    for(location in leftLocations) {
+        val amountOfTimes = rightLocations.count { it == location }
+        answer += location * amountOfTimes
+    }
+
+    return answer
+}
+
+val prodCheck = useProd()
+val file = File(if(prodCheck) "input.txt" else "example.txt")
+val content = file.readText()
+val challengeNumber = getChallenge()
+
+val answer = if(challengeNumber == '1') challenge1(content) else if(challengeNumber == '2') challenge2(content) else 0
+println("The answer is $answer!")