day6

src/day6/example.txt

@@ -0,0 +1 @@
+3,4,3,1,2

src/day6/index.ts

@@ -0,0 +1,35 @@
+import path from 'path';
+import {readFile} from "../utils";
+
+let input = readFile(path.resolve(__dirname, 'input.txt'))[0].split(",");
+
+// prepare the buckets of fish
+let buckets = [0, 0, 0, 0, 0, 0, 0, 0, 0];
+input.forEach(number => {
+    const num = parseInt(number);
+    buckets[num - 1]++;
+})
+
+const numFish = (days) => {
+    for (let k = 1; k < days; k++) {
+        let diff = [0, 0, 0, 0, 0, 0, 0, 0, 0];
+        for (let i = 0; i < 9; i++) {
+            const numFish = buckets[i];
+            if (i === 0) {
+                diff[8] += numFish;
+                diff[6] += numFish;
+                diff[0] -= numFish;
+            } else {
+                diff[i] -= numFish;
+                diff[i - 1] += numFish;
+            }
+        }
+        for (let i = 8; i >= 0; i--) {
+            buckets[i] += diff[i];
+        }
+    }
+    return buckets.reduce((a, b) => a + b, 0);
+}
+
+console.log("Part 1:", numFish(80));
+console.log("Part 2:", numFish(256));

src/day6/input.txt

@@ -0,0 +1 @@
+3,5,4,1,2,1,5,5,1,1,1,1,4,1,4,5,4,5,1,3,1,1,1,4,1,1,3,1,1,5,3,1,1,3,1,3,1,1,1,4,1,2,5,3,1,4,2,3,1,1,2,1,1,1,4,1,1,1,1,2,1,1,1,3,1,1,4,1,4,1,5,1,4,2,1,1,5,4,4,4,1,4,1,1,1,1,3,1,5,1,4,5,3,1,4,1,5,2,2,5,1,3,2,2,5,4,2,3,4,1,2,1,1,2,1,1,5,4,1,1,1,1,3,1,5,4,1,5,1,1,4,3,4,3,1,5,1,1,2,1,1,5,3,1,1,1,1,1,5,1,1,1,1,1,1,1,2,2,5,5,1,2,1,2,1,1,5,1,3,1,5,2,1,4,1,5,3,1,1,1,2,1,3,1,4,4,1,1,5,1,1,4,1,4,2,3,5,2,5,1,3,1,2,1,4,1,1,1,1,2,1,4,1,3,4,1,1,1,1,1,1,1,2,1,5,1,1,1,1,2,3,1,1,2,3,1,1,3,1,1,3,1,3,1,3,3,1,1,2,1,3,2,3,1,1,3,5,1,1,5,5,1,2,1,2,2,1,1,1,5,3,1,1,3,5,1,3,1,5,3,4,2,3,2,1,3,1,1,3,4,2,1,1,3,1,1,1,1,1,1