@@ -20,6 +20,7 @@ public static void main(String[] args) {
2020 Day15 day = new Day15 ();
2121 day .printParts ();
2222 new com .sbaars .adventofcode .network .Submit ().submit (day .part1 (), 2015 , 15 , 1 );
23+ new com .sbaars .adventofcode .network .Submit ().submit (day .part2 (), 2015 , 15 , 2 );
2324 }
2425
2526 private void parseInput () {
@@ -45,7 +46,7 @@ public Object part1() {
4546
4647 @ Override
4748 public Object part2 () {
48- return 0 ; // Implement in next part
49+ return findBestScoreWithCalories ( 500 );
4950 }
5051
5152 private long findBestScore () {
@@ -56,6 +57,15 @@ private long findBestScore() {
5657 .orElse (0 );
5758 }
5859
60+ private long findBestScoreWithCalories (int targetCalories ) {
61+ return generateCombinations (TOTAL_TEASPOONS , ingredients .size ())
62+ .stream ()
63+ .filter (amounts -> calculateCalories (amounts ) == targetCalories )
64+ .mapToLong (this ::calculateScore )
65+ .max ()
66+ .orElse (0 );
67+ }
68+ 5969 private List <List <Integer >> generateCombinations (int total , int parts ) {
6070 List <List <Integer >> result = new ArrayList <>();
6171 generateCombinationsHelper (total , parts , new ArrayList <>(), result );
@@ -100,6 +110,14 @@ private long calculateScore(List<Integer> amounts) {
100110 return (long ) capacity * durability * flavor * texture ;
101111 }
102112
113+ private int calculateCalories (List <Integer > amounts ) {
114+ int calories = 0 ;
115+ for (int i = 0 ; i < ingredients .size (); i ++) {
116+ calories += ingredients .get (i ).calories * amounts .get (i );
117+ }
118+ return calories ;
119+ }
120+ 103121 private static class Ingredient {
104122 private final String name ;
105123 private final int capacity ;
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