day 2

day2/part1.ts

@@ -0,0 +1,17 @@
+export async function solve() {
+    return await Deno.readTextFile("./input.txt").then((f) =>
+        f.split("\n").filter((l) => {
+            const report = l.split(" ").map((s) => +s);
+            const increasing = report[0] < report[1];
+            let last = report[0];
+            for (const number of report.slice(1)) {
+                if (number > last && !increasing) return false;
+                if (number < last && increasing) return false;
+                if (Math.abs(number - last) < 1 || Math.abs(number - last) > 3) return false;
+    
+                last = number;
+            }
+            return true;
+        }).reduce(acc => acc + 1, 0)
+    );    
+}

day2/part2.ts

@@ -0,0 +1,29 @@
+export async function solve() {
+    return await Deno.readTextFile("./input.txt").then((f) =>
+        f.split("\n").filter((l) => {
+            const report = l.split(" ").map((s) => +s);
+            for (let i = 0; i < report.length; i++) {
+                const sliced = [
+                    ...report.slice(0, i),
+                    ...report.slice(i + 1, report.length),
+                ];
+                const increasing = sliced[0] < sliced[1];
+                let last = sliced[0];
+                let failed = false;
+                for (const number of sliced.slice(1)) {
+                    if (number > last && !increasing) failed = true;
+                    if (number < last && increasing) failed = true;
+                    if (
+                        Math.abs(number - last) < 1 ||
+                        Math.abs(number - last) > 3
+                    ) failed = true;
+
+                    last = number;
+                }
+                if (failed) continue;
+                else return true;
+            }
+            return false;
+        }).reduce((acc) => acc + 1, 0)
+    );
+}