Day19 WIP

days/src/main/kotlin/Day19.kt

@@ -0,0 +1,159 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.input.Day
+import be.vandewalleh.aoc.utils.input.Groups
+import be.vandewalleh.aoc.utils.input.Input
+import be.vandewalleh.aoc.utils.input.createDay
+import org.slf4j.LoggerFactory
+
+sealed class Rule {
+    data class CharRule(val value: Char) : Rule()
+    data class OrRule(val a: List<Int>, val b: List<Int>?) : Rule()
+}
+
+@Day(19)
+class Day19(@Groups val input: Input<List<List<String>>>) {
+    private val rules = input.value[0]
+    private val messages = input.value[1]
+
+    private val logger = LoggerFactory.getLogger("Day19")
+
+    // [[a], [b]] -> [ab]
+    // [[a], [ab, ba]] -> [aab, aba]
+    // [[ab, ba], [a]] -> [aba, baa]
+    // [[a], [b], [c]] -> [abc]
+    // [[ab], [cd], [e]] -> [abcde]
+    // [[ab, ba], [cd, e]] -> [abcd, abe, bacd, bae]
+    // [[ab, ba], [cd, e], [yy, z] -> [abcdyy, abcdz, abeyy, abez, bacdyy, bacdz, baeyy, baez]
+    private fun combine(lists: List<List<String>>) = lists.reduce { acc, list -> combine(acc, list) }
+
+    private fun combine(a: List<String>, b: List<String>): MutableList<String> {
+        val combinations = mutableListOf<String>()
+        a.forEach { f ->
+            b.forEach { s ->
+                combinations.add(f + s)
+            }
+        }
+        return combinations
+    }
+
+    private fun generateSolutions(
+        chars: MutableMap<Int, Char>,
+        rules: MutableMap<Int, MutableList<MutableList<Int>>>,
+    ): Map<Int, List<String>> {
+
+        val solutions = mutableMapOf<Int, MutableList<String>>()
+
+        for ((index, char) in chars) {
+            solutions[index] = mutableListOf(char.toString())
+        }
+
+        fun debug() {
+            if(logger.isDebugEnabled){
+                logger.debug("---")
+                logger.debug(rules.entries.joinToString("\n"))
+                val prettySolutions = buildString {
+                    append("\nsolutions:")
+                    appendLine()
+                    solutions.entries.forEach { (k, v) ->
+                        append(k)
+                        append(" [")
+                        appendLine()
+                        v.forEach {
+                            append("\t")
+                            append(it)
+                            append("\n")
+                        }
+                        append("]")
+                        appendLine()
+                    }
+                }
+                logger.debug(prettySolutions)
+            }
+        }
+
+        debug()
+
+        while (rules.isNotEmpty()) {
+            val mapIterator = rules.iterator()
+            while (mapIterator.hasNext()) {
+                val (k, values) = mapIterator.next()
+
+                val valueIterator = values.iterator()
+                while (valueIterator.hasNext()) {
+                    val value: MutableList<Int> = valueIterator.next()
+
+                    if (value.any { rules.contains(it) }) continue
+
+                    val sol = value.mapNotNull { solutions[it] }
+                    if (sol.size != value.size) continue
+
+                    val solution = solutions.computeIfAbsent(k) { mutableListOf() }
+
+                    val combined = combine(sol)
+                    solution.addAll(combine(sol))
+
+                    if(logger.isDebugEnabled){
+                        logger.debug(":::$k")
+                        logger.debug(":::$value")
+                        logger.debug(":::$sol -> $combined")
+                    }
+
+                    valueIterator.remove()
+                }
+
+                if (values.isEmpty()) mapIterator.remove()
+            }
+            debug()
+        }
+
+        return solutions
+    }
+
+    private fun matches(input: String, solution: List<String>) = solution.any { it == input }
+
+    fun part1(): Int {
+        val parsedRules = parseRules()
+
+        val chars = mutableMapOf<Int, Char>()
+        val rules = mutableMapOf<Int, MutableList<MutableList<Int>>>()
+
+        for ((index, rule) in parsedRules) {
+            when (rule) {
+                is Rule.CharRule -> chars[index] = rule.value
+                is Rule.OrRule -> listOfNotNull(rule.a, rule.b)
+                    .forEach { rules.computeIfAbsent(index) { mutableListOf() }.add(it.toMutableList()) }
+            }
+        }
+
+        val solutions: Map<Int, List<String>> = generateSolutions(chars, rules)
+        val zero = solutions[0]!!
+
+        return messages.count { matches(it, zero) }
+    }
+
+    private fun parseRules(): MutableMap<Int, Rule> {
+        val parsedRules = mutableMapOf<Int, Rule>()
+        rules.forEach {
+            val parts = it.split(":", limit = 2)
+            val index = parts[0].toInt()
+            val rule = if ("\"" !in parts[1]) {
+                val p = parts[1].split('|', limit = 2).map { it.trim().split(" ").mapTo(ArrayList(2)) { it.toInt() } }
+                Rule.OrRule(p[0], if (p.size == 2) p[1] else null)
+            } else {
+                Rule.CharRule(parts[1].trim().replace("\"", "")[0])
+            }
+            parsedRules[index] = rule
+        }
+        return parsedRules
+    }
+
+    fun part2() {
+
+    }
+}
+
+fun main() = with(createDay<Day19>()) {
+    println(part1())
+    println(part2())
+}

days/src/main/resources/day19.txt

@@ -0,0 +1,536 @@
+107: 18 | 47
+116: 1 18 | 111 47
+21: 45 47 | 110 18
+20: 2 47 | 76 18
+44: 47 47 | 18 107
+2: 47 18 | 107 47
+113: 51 47 | 35 18
+80: 18 22 | 47 44
+110: 18 18 | 47 107
+1: 22 18 | 112 47
+77: 47 7 | 18 113
+16: 121 47 | 2 18
+66: 91 18 | 58 47
+86: 12 18 | 78 47
+72: 18 76 | 47 121
+46: 47 68 | 18 82
+131: 66 18 | 75 47
+108: 84 18 | 24 47
+27: 22 47 | 110 18
+53: 108 18 | 122 47
+90: 77 47 | 37 18
+6: 18 29 | 47 52
+10: 76 18 | 44 47
+43: 47 39 | 18 130
+106: 18 112 | 47 110
+89: 97 47 | 51 18
+84: 112 18
+91: 74 47 | 110 18
+114: 18 47 | 107 18
+105: 26 18 | 118 47
+18: "b"
+19: 2 47 | 22 18
+15: 34 47 | 2 18
+111: 110 47 | 22 18
+94: 47 95 | 18 57
+34: 107 107
+60: 47 114 | 18 121
+62: 44 47 | 45 18
+50: 38 47 | 103 18
+61: 18 44 | 47 110
+87: 112 107
+8: 42
+31: 18 49 | 47 25
+57: 18 20 | 47 60
+103: 18 67 | 47 40
+39: 18 45 | 47 22
+128: 112 18 | 13 47
+5: 45 47 | 44 18
+13: 18 18
+3: 47 10 | 18 80
+11: 42 31
+124: 22 18
+88: 18 18 | 47 18
+54: 32 18 | 129 47
+63: 81 18 | 86 47
+49: 18 132 | 47 105
+102: 10 18 | 120 47
+93: 18 44 | 47 34
+65: 107 2
+132: 83 47 | 14 18
+125: 18 43 | 47 71
+109: 47 22 | 18 76
+117: 18 112 | 47 22
+59: 47 22 | 18 13
+75: 18 109 | 47 27
+4: 47 90 | 18 69
+48: 18 65 | 47 115
+24: 18 2 | 47 44
+42: 47 50 | 18 4
+96: 106 47 | 16 18
+101: 111 47 | 91 18
+58: 47 76 | 18 73
+79: 47 73 | 18 22
+12: 47 34 | 18 88
+25: 33 47 | 55 18
+130: 18 114 | 47 44
+83: 126 18 | 102 47
+45: 47 18
+9: 41 18 | 62 47
+78: 112 18 | 45 47
+14: 3 47 | 85 18
+97: 47 45 | 18 22
+22: 18 47
+41: 18 22 | 47 112
+112: 18 47 | 18 18
+68: 21 18 | 19 47
+121: 47 47 | 18 18
+119: 22 47
+129: 47 5 | 18 39
+30: 73 18 | 2 47
+98: 34 18 | 45 47
+40: 18 70 | 47 9
+7: 64 47 | 79 18
+115: 121 47 | 44 18
+32: 19 47 | 30 18
+73: 18 47 | 47 18
+35: 18 76 | 47 45
+95: 93 18 | 72 47
+52: 28 47 | 124 18
+126: 59 18 | 92 47
+26: 104 18 | 89 47
+81: 47 98 | 18 127
+0: 8 11
+64: 112 47
+71: 47 119 | 18 117
+74: 47 47
+82: 47 120 | 18 17
+56: 74 47 | 88 18
+123: 88 47 | 76 18
+33: 6 18 | 63 47
+104: 80 18 | 128 47
+99: 98 18 | 23 47
+38: 94 18 | 53 47
+36: 47 110 | 18 74
+37: 47 48 | 18 101
+70: 61 47 | 87 18
+55: 47 54 | 18 131
+23: 2 47 | 112 18
+122: 10 47 | 64 18
+120: 88 18 | 112 47
+28: 18 112 | 47 73
+51: 47 74 | 18 110
+17: 47 88 | 18 22
+127: 18 73 | 47 45
+69: 125 18 | 46 47
+92: 2 47 | 114 18
+29: 117 18 | 56 47
+67: 18 96 | 47 116
+85: 18 36 | 47 15
+100: 18 123 | 47 12
+47: "a"
+118: 100 47 | 99 18
+76: 47 47 | 47 18
+
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