2019.24.1 calc biodiversity for demo content

hsegnitz · hsegnitz · commit baf6d9e3d2f8 · 2019-12-24T12:59:55.000+01:00
diff --git a/java/src/main/java/y2019/d24/Part1.java b/java/src/main/java/y2019/d24/Part1.java
@@ -43,15 +43,30 @@ public static void main(String[] args) {
             }
 
             mapString = mapToString(newMap);
+            map = newMap;
 
             if (!seen.add(mapString)) {
                 break;
             }
             //System.out.println(mapString);
-            map = newMap;
         }
 
         System.out.println(mapString);
+        System.out.println(biodiversityRating(map));
+    }
+
+    private static int biodiversityRating(boolean[][] inMap) {
+        int exponent = -1;
+        int biodiversityRating = 0;
+        for (boolean[] line: inMap) {
+            for (boolean field: line) {
+                exponent++;
+                if (field) {
+                    biodiversityRating += Math.pow(2, exponent);
+                }
+            }
+        }
+        return biodiversityRating;
     }
 
     private static boolean willLive(int x, int y) {
