Solved day 17 part 1

Author: Gentleman1983

build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 // project meta data
 group 'de.havox_design.aoc2015'
-version '0.16.1'
+version '0.16.2'
 
 // Switch to gradle "all" distribution.
 wrapper {

day17/src/main/java/de/havox_design/aoc2015/day17/MainClass.java

@@ -6,7 +6,7 @@ public class MainClass {
     private static final Logger LOGGER = Logger.getLogger(MainClass.class.getName());
 
     public static void main(String[] args) {
-        LOGGER.info("Solution 1: 13");
-        LOGGER.info("Solution 2: 23");
+        LOGGER.info(() -> "Solution 1: " + NotEnoughEggnod.solvePart1("day17.txt"));
+        LOGGER.info(() -> "Solution 2: " + NotEnoughEggnod.solvePart2("day17.txt"));
     }
 }

day17/src/main/java/de/havox_design/aoc2015/day17/NotEnoughEggnod.java

@@ -0,0 +1,57 @@
+package de.havox_design.aoc2015.day17;
+
+import de.havox_design.aoc2015.utils.DataReader;
+
+import java.util.List;
+
+public class NotEnoughEggnod {
+    private final List<Integer> input;
+
+    public NotEnoughEggnod(String fileName) {
+        input = readData(fileName)
+                .stream()
+                .map(Integer::parseInt)
+                .toList();
+    }
+
+    public static int solvePart1(String fileName) {
+        NotEnoughEggnod instance = new NotEnoughEggnod(fileName);
+        return instance.solvePart1();
+    }
+
+    protected static int countCombinations(String fileName, int amountOfEggnod) {
+        NotEnoughEggnod instance = new NotEnoughEggnod(fileName);
+        return instance.countWays(instance.input, 0, amountOfEggnod, 0);
+    }
+
+    public static int solvePart2(String fileName) {
+        NotEnoughEggnod instance = new NotEnoughEggnod(fileName);
+        return instance.solvePart2();
+    }
+
+    public int solvePart1() {
+        return countWays(input, 0, 150, 0);
+    }
+
+    public int solvePart2() {
+        return 0;
+    }
+
+    private int countWays(List<Integer> containers, int startIndex, int target, int countSoFar) {
+        if (target == 0) {
+            return 1;
+        } else if (target < 0) {
+            return 0;
+        } else {
+            int count = countSoFar;
+            for (int i = startIndex; i < containers.size(); ++i) {
+                count += countWays(containers, i + 1, target - containers.get(i), countSoFar);
+            }
+            return count;
+        }
+    }
+
+    private List<String> readData(String fileName) {
+        return DataReader.readData(fileName, MainClass.class);
+    }
+}

day17/src/test/java/de/havox_design/aoc2015/day17/Day17Test.java

@@ -1,6 +1,12 @@
 package de.havox_design.aoc2015.day17;
 
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.stream.Stream;
 
 class Day17Test {
 
@@ -9,4 +15,16 @@ class Day17Test {
     void testMainClass() {
         MainClass.main(new String[0]);
     }
+
+    @ParameterizedTest
+    @MethodSource("getDataForPart1")
+    void testPart1(String fileName, int expectedNumberOfCombinations) {
+        Assertions.assertEquals(expectedNumberOfCombinations, NotEnoughEggnod.countCombinations(fileName, 25));
+    }
+
+    private static Stream<Arguments> getDataForPart1() {
+        return Stream.of(
+                Arguments.of("part1sample.txt", 4)
+        );
+    }
 }

day17/src/test/resources/part1sample.txt

@@ -0,0 +1,5 @@
+20
+15
+10
+5
+5