Day 2

pom.xml

@@ -46,6 +46,9 @@
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-maven-plugin</artifactId>
                 <version>${kotlin.version}</version>
+                <configuration>
+                    <jvmTarget>1.8</jvmTarget>
+                </configuration>
                 <executions>
                     <execution>
                         <id>compile</id>

src/main/kotlin/com/basdado/adventofcode/Day2.kt

@@ -0,0 +1,62 @@
+package com.basdado.adventofcode
+
+import java.nio.file.Files
+import java.nio.file.Paths
+import java.util.stream.Collectors
+import java.util.stream.Stream
+
+fun main() {
+
+    puzzle1()
+    puzzle2()
+}
+
+fun puzzle1() {
+    println(
+        lines()
+            .flatMap{ line -> line.chars().mapToObj{ Integer.valueOf(it) }
+                // Count how many times each character appears per word
+                .collect(Collectors.groupingBy( { it }, Collectors.counting()))
+                 // Filter on characters appearing more than once
+                .filter { it.value > 1L }
+                .map { it.value }
+                .distinct()
+                .stream()
+            }
+            .collect(Collectors.groupingBy({ it }, Collectors.counting()))
+            .map { it.value }
+            .stream()
+            .mapToLong { it }
+            .reduce { left, right -> left * right }
+            .orElse(0L)
+    )
+}
+
+fun puzzle2() {
+
+    val ids = lines().collect(Collectors.toList())
+    for (i in 0 until ids.size) {
+
+        val shortIds = ids.stream()
+            .map { it.substring(0, i) + it.substring(i + 1) }
+            .sorted()
+            .collect(Collectors.toList())
+
+        var lastId = ""
+        for (shortId in shortIds) {
+            if (lastId == shortId) {
+                println(shortId)
+                return
+            }
+            lastId = shortId
+        }
+    }
+
+}
+
+fun lines(): Stream<String> {
+//    return Stream.of("abcdef", "bababc", "abbcde", "abcdef", "abcccd", "aabcdd", "abcdee", "ababab")
+    return Files.lines(Paths.get(Day2::class.java.getResource("/day/2/input.txt").toURI()))
+}
+
+class Day2

src/main/resources/day/2/input.txt

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