Advent of Code 2021 - Day 6 - blog post

Author: CodingNagger

README.md

@@ -22,4 +22,5 @@ Last year I ran a [cruise log for my 25 days competing in the Advent of Code](ht
 - [The Advent of Code 2021 Day 2 log, sneaky release](https://www.codingnagger.com/2021/12/02/the-advent-of-code-2021-day-2-log-sneaky-release/)
 - [The Advent of Code 2021 Day 3 log, sleepy brain](https://www.codingnagger.com/2021/12/03/the-advent-of-code-2021-day-3-log-sleepy-brain/)
 - [The Advent of Code 2021 Day 4 log, playing myself](https://www.codingnagger.com/2021/12/04/the-advent-of-code-2021-day-4-log-playing-myself/)
-- [The Advent of Code 2021 Day 5 log, pointless points](https://www.codingnagger.com/2021/12/05/the-advent-of-code-2021-day-5-log-pointless-points/)
+- [The Advent of Code 2021 Day 5 log, pointless points](https://www.codingnagger.com/2021/12/05/the-advent-of-code-2021-day-5-log-pointless-points/)
+- [The Advent of Code 2021 Day 6 log, plenty of fish](https://www.codingnagger.com/2021/12/06/the-advent-of-code-2021-day-6-log-plenty-of-fish/)

src/main/java/com/codingnagger/days/Day6.java

@@ -53,7 +53,9 @@ public void run(int cycleCount) {
         public void tick() {
             BigInteger newBorns = fishes[0];
 
-            System.arraycopy(fishes, 1, fishes, 0, 8);
+            for (int i = 1; i < 9; i++) {
+                fishes[i-1] = fishes[i];
+            }
 
             fishes[6] = fishes[6].add(newBorns);
             fishes[8] = newBorns;